<!-- generated-by: gsd-doc-writer -->
# arah² — Development Guide

Contributor-facing reference for working on arah² day to day: local setup, the
per-workspace dev loop, the build commands, the code style the project actually
enforces, branch and commit conventions, and the project-specific gates you must
not break.

For *using* the app, see the [README](../README.md). For *how the system is put
together*, see [ARCHITECTURE.md](./ARCHITECTURE.md). For *what to configure*
(secrets, `wrangler.jsonc`, env vars), see [CONFIGURATION.md](./CONFIGURATION.md).
For the road-graph fork contract, see [ROAD-GRAPH.md](./ROAD-GRAPH.md). For the
free-tier posture, see [BUDGETS.md](./BUDGETS.md).

---

## Local setup

### Prerequisites

| Requirement | Notes |
| --- | --- |
| Node.js + npm | No `engines` field and no `.nvmrc`/`.node-version` exist in the repo. The README says to use a current Node.js LTS. <!-- VERIFY: the actual minimum Node.js version — nothing in the repository pins it; confirm with maintainers. --> The `@araharah/search` and `@araharah/routing` sources are consumed by plain Node (the corpus runners rely on Node's type-stripping for relative `.ts` imports — the source headers call out Node 24). |
| npm with workspace support | npm 7+ required for `workspaces`. The repo uses npm exclusively — `package-lock.json` is committed and there is no `pnpm-lock.yaml` or `yarn.lock`. |
| A Cloudflare account | `wrangler` authenticates on first use via an interactive browser login. Needed for `bot:dev`, `bot:deploy`, KV access, and the R2 bucket (road graph). |
| A Telegram bot token | From @BotFather. Required by `bot:dev` and by every script in `bot/scripts/`. |
| Python 3 | Only for `theme`'s `gallery` / `basemap:preview`, which serve on port `8123` via `python3 -m http.server 8123`. |
| Network access | Fonts, tiles, the Play CDN in the mockup reference pages, and the Overpass fetch inside `build-road-graph.mjs` are all fetched over the network; the capture harnesses need it. |

### Clone and install

```bash
git clone http://gitmirah:3000/c-fu/arah2.git
cd arah2
npm install
```

`npm install` at the root installs all five workspaces (`theme`, `bot`, `web`,
`search`, `routing`) at once — npm hoists shared deps into the root
`node_modules/`. There is no per-workspace `npm install` step.

### Configure local secrets

There is no committed `.env`. The Worker reads secrets from `bot/.dev.vars`
(gitignored via `bot/.gitignore`):

```bash
cp bot/.dev.vars.example bot/.dev.vars
# then edit bot/.dev.vars and fill in BOT_TOKEN, WEBHOOK_SECRET, WEBHOOK_URL, MINI_APP_URL
```

`MINI_APP_URL` is the public Mini App origin (not a secret) the `/cari` venue
card's OPEN deep link is built from; it must match the URL registered in
@BotFather. Full details, including the `process.env` vs `.dev.vars` precedence
rule, are in [CONFIGURATION.md](./CONFIGURATION.md#environment-variables).

### Fork provisioning (before first run against real infra)

A fresh fork needs its own road graph and its own bindings before `bot:dev` /
`bot:deploy` route for real:

1. **Create the R2 bucket** (road-graph host — public configuration, never a
   secret): `npx wrangler r2 bucket create araharah-graphs` (or your own name —
   it must agree with `bot/wrangler.jsonc`'s `ROAD_GRAPH` `bucket_name`).
2. **Build the graph**: `node routing/scripts/build-road-graph.mjs` — fetches one
   Overpass extract and encodes `routing/data/kl-roadgraph.v1.bin` (build
   artifact, gitignored). `--check <file>` validates it offline. **Do not commit
   the binary.**
3. **Upload it**: `node routing/scripts/upload-road-graph.mjs` (1 MB floor / 80 MB
   ceiling pre-flight).
4. **Point the webhook**: `npm run bot:deploy` runs `wrangler deploy` +
   `scripts/set-webhook.mjs` automatically; or set it standalone.

Steps 1–3 are spelled out fully in [ROAD-GRAPH.md](./ROAD-GRAPH.md) — that doc is
the fork contract. The search gazetteer needs no provisioning: its dataset
(`search/src/data/kl-gazetteer.json`) is committed.

### Pre-build before first run

Both `npm run dev` and `npm run deploy` run the build first, but building by hand
first gives you faster feedback:

```bash
npm run build      # theme -> web (this is the deployable artifact)
```

---

## The dev loop

```mermaid
graph TD
    classDef edit fill:#EB8008,stroke:#1A1A1A,stroke-width:2px,color:#1A1A1A
    classDef check fill:#D9D2C6,stroke:#1A1A1A,stroke-width:2px,color:#1A1A1A
    classDef gate fill:#ED3F1C,stroke:#1A1A1A,stroke-width:2px,color:#FFFFFF

    EDIT["Edit source<br/>bot/src, web/src, theme/src,<br/>search/src, routing/src"]:::edit
    TC["npm run bot:typecheck<br/>npm run web:typecheck<br/>npm run search:typecheck<br/>npm run routing:typecheck"]:::check
    T1["npm run bot:test"]:::check
    T2["npm run web:test"]:::check
    T3["npm run search:test"]:::check
    T4["npm run routing:test"]:::check
    AU["npm run audit<br/>off-token CSS audit"]:::check
    BUILD["npm run build<br/>theme then web"]:::check
    DEV1["npm run bot:dev<br/>wrangler dev :8787"]:::edit
    DEV2["npm run web:dev<br/>vite :5173"]:::edit
    HARN["npm run web:build:harness<br/>+ npm run web:capture"]:::check
    COMMIT["git commit<br/>type(phase): subject"]:::gate

    EDIT --> TC
    EDIT --> T1
    EDIT --> T2
    EDIT --> T3
    EDIT --> T4
    EDIT --> AU
    TC --> BUILD
    T1 --> BUILD
    T2 --> BUILD
    T3 --> BUILD
    T4 --> BUILD
    AU --> BUILD
    BUILD --> DEV1
    BUILD --> DEV2
    BUILD --> HARN
    DEV1 --> COMMIT
    DEV2 --> COMMIT
    HARN --> COMMIT
    COMMIT --> EDIT
```

### Bot workspace (`@araharah/bot`)

```bash
npm run bot:dev        # wrangler dev --port 8787 --local
```

Runs the Worker on <http://localhost:8787>. `--local` keeps everything on
Miniflare: KV is emulated under `bot/.wrangler/` (gitignored) and nothing touches
the production namespace. Secrets come from `bot/.dev.vars`.

The Worker serves both the API and the Mini App static assets, so after changing
anything under `web/` you must rebuild for `wrangler dev` to serve the new
bundle:

```bash
npm run build && npm run bot:dev
```

The cron trigger is exercisable locally under `wrangler dev`:

```bash
curl "http://localhost:8787/cdn-cgi/local/scheduled"
```

### Web workspace (`@araharah/web`)

```bash
npm run web:dev        # vite dev server on http://localhost:5173
```

Vite is configured with `port: 5173` and `strictPort: true`, so it will fail
rather than silently pick 5174.

Important: **there is no Worker behind the Vite dev server.** `main.ts` calls
relative paths (`/api/session`, `/api/location`), which 404 against plain Vite.
For interactive work against a real API, either run `bot:dev` and open
<http://localhost:8787> (the Worker serves the built bundle), or use the harness
below. In `import.meta.env.DEV`, `main.ts` falls back to the mock Telegram
WebApp so the shell still renders.

### Harness (Mock-Telegram) workflow

The Mini App's UI can be driven without Telegram at all. The harness build swaps
in `web/src/mock/telegram-mock.ts` plus `/api/*` fetch stubs:

```bash
npm run web:build:harness    # vite build --mode harness -> web/dist-harness/
npm run web:capture          # Playwright screenshots of every boot/live/denied state
```

`npm run web:capture` serves `web/dist-harness` (never `web/dist` — the harness
block is dead-code-eliminated from the production build) and writes
`web/screenshots/*.png` (gitignored). It waits on the `RAMS-BASEMAP-READY` and
`ARAHARAH-LIVE` console signals and runs the GEO-03 runtime storage probe in-page
before declaring success.

Harness URL parameters, documented in `web/index.html`:

| Parameter | Values | Effect |
| --- | --- | --- |
| `?mock=` | `android`, `ios`, `tdesktop`, `macos`, `web` | Which Telegram client surface to simulate |
| `?scheme=` | `light`, `dark` | Telegram color scheme |
| `?pin=` | `1` | Drive the chat-pin relay link (`?pin=1` stubs `/api/location`) |
| `?locale=` | `en`, `ms` | Force a locale |
| `?sessiondelay=` | milliseconds | Delay the session handshake |
| `?fixdelay=` | milliseconds | Delay the location fix |

### Search workspace (`@araharah/search`)

```bash
npm run search:typecheck   # tsc --noEmit
npm run search:test        # node test/runner.mjs — unit suites + corpus assertions
npm run search:corpus      # the golden-corpus bake-off (search/scripts/gazetteer-corpus.mjs)
```

`search:corpus` measures the pinned golden corpus against the SAME shared search
module the bot and the Mini App import — exit 0 only when top-3 hit rate clears
the corpus threshold AND every negative is refused (zero leaks). `corpus.test.mjs`
asserts the same measurements in-process, so a corpus regression fails the suite
too. Two further maintainer scripts regenerate the dataset when needed:
`search/scripts/overpass-topup.mjs` (fetch more POIs) and
`search/scripts/json-to-sqlite.mjs` — the committed dataset has an ODbL notice
inside its envelope.

### Routing workspace (`@araharah/routing`)

```bash
npm run routing:typecheck  # tsc --noEmit
npm run routing:test       # node test/runner.mjs — codec, snap, A*, seams
npm run routing:corpus     # the offline tolerance gate (routing/scripts/route-corpus.mjs)
npm run routing:fixtures   # regenerate fixtures from the OSRM demo server (maintainer tool)
npm run glyphs -w routing  # render the turn-card PNGs into web/public/glyphs/
```

`routing:corpus` is fully offline (zero network in the measurement path): it
measures the committed fixture dataset against the same module the webview
imports. `routing:fixtures` is the only step that touches the OSRM demo server —
the committed fixtures were generated there, and the committed dataset is what
ships. The graph binary track lives under `routing/data/` (see *Fork
provisioning* above and [ROAD-GRAPH.md](./ROAD-GRAPH.md)); `build-road-graph.mjs`
and `upload-road-graph.mjs` are maintainer tools, and
`scripts/measure-route-cpu.mjs` feeds the budget audit's route-CPU gate.

### Theme workspace (`@araharah/theme`)

```bash
npm run build -w theme     # src/theme.css -> dist/rams.css (minified)
npm run sheet              # build, then open theme/src/sheet.html
npm run gallery            # build + capture, then serve gallery.html + basemap on :8123
npm run audit              # off-token audit of the rendered CSS
```

`npm run audit` and `npm run capture` are the two pieces of design-system
evidence tooling. `capture` renders `sheet.html` and the four read-only mockups
via Playwright and writes `theme/screenshots/` (gitignored). `gallery` blocks on
`python3 -m http.server 8123` serving the theme workspace, so stop it with
`Ctrl-C` when done.

Note that `npm run gallery` ends with a **blocking** `basemap:preview` server —
it will appear to hang. That is expected.

### Registering bot commands

The Telegram `/` menu is persistent server state, not something the Worker pushes.
Register it explicitly after adding or renaming a command:

```bash
npm run bot:commands      # node scripts/register-commands.mjs
```

`bot/scripts/register-commands.mjs` reads `BOT_TOKEN` (from `process.env`, else
from `bot/.dev.vars`), derives each description from the `helpMenu` lines in
`bot/src/i18n/strings.ts`, and makes six `setMyCommands` calls (default en/ms, all_private_chats en/ms, and the two stale group-scope clears) — one for
the default scope (English) and one for `language_code: "ms"` (Malay). Because
the descriptions are *derived* from the same strings `/help` replies with, the
menu and the reply cannot drift.

If you add a command, you must add it to the `menuFor()` command array **and** to
the corresponding `helpMenu` lines — the script throws
`helpMenu for "<locale>" is missing its /<command> line (D-03 copy drift)` if the
two disagree. The gate `CS5 D-03: register-commands derives both scopes from
helpMenu` in `bot/test/commands.test.mjs` enforces this.

Only re-run this when the command *list or its descriptions* change. Repointing
the webhook is a separate script (`set-webhook.mjs`), run automatically by
`npm run deploy`. `scripts/set-menu-button.mjs` sets the BotFather menu-button
deep link (separate server state, rerun after origin changes).

---

## Build and check commands

### Root scripts (`package.json`)

| Command | Description |
| --- | --- |
| `npm run build` | Build `theme`, then `web`. Produces the deployable artifact. |
| `npm run dev` | `build`, then `bot:dev` — the one-command local app loop. |
| `npm run deploy` | `build`, then `bot:deploy` (`wrangler deploy` + `set-webhook.mjs`). |
| `npm run privacy-audit` | The consolidated privacy audit — five static gates + `--live` probes (`node scripts/privacy-audit.mjs`). |
| `npm run budget-audit` | The consolidated free-tier budget audit — six measurement gates + the comparison table (`node scripts/budget-audit.mjs`). |
| `npm run bot:test` | `npm test -w bot` — the bot's hand-rolled suite. |
| `npm run bot:typecheck` | `tsc --noEmit` in `bot`. |
| `npm run bot:dev` | `npm run dev -w bot` — `wrangler dev --port 8787 --local`. |
| `npm run bot:deploy` | `wrangler deploy && node scripts/set-webhook.mjs`. |
| `npm run bot:commands` | Register the Telegram command menu (EN + MS). |
| `npm run web:test` | `npm test -w web` — the Mini App suite. |
| `npm run web:typecheck` | `tsc --noEmit` in `web`. |
| `npm run web:dev` | `npm run dev -w web` — Vite dev server on 5173. |
| `npm run web:build` | Alias of `build` (theme then web). |
| `npm run web:build:harness` | Harness-mode build into `web/dist-harness/`. |
| `npm run web:capture` | Playwright screenshots of the Mini App states. |
| `npm run search:test` | `npm test -w search` — the gazetteer suite (incl. corpus assertions). |
| `npm run search:typecheck` | `tsc --noEmit` in `search`. |
| `npm run search:corpus` | The golden-corpus search bake-off. |
| `npm run routing:test` | `npm test -w routing` — the routing suite (codec, snap, A\*, seams). |
| `npm run routing:typecheck` | `tsc --noEmit` in `routing`. |
| `npm run routing:corpus` | The offline route-tolerance gate. |
| `npm run routing:fixtures` | Regenerate committed fixtures from the OSRM demo server (maintainer tool). |
| `npm run sheet` | Passthrough to the theme workspace. |
| `npm run gallery` | Passthrough to the theme workspace. |
| `npm run audit` | Passthrough to the theme workspace — off-token CSS audit. |
| `npm run capture` | Passthrough to the theme workspace — token-sheet screenshots. |

### Workspace-local scripts

| Command | Where | Description |
| --- | --- | --- |
| `npm test` | `bot`, `web`, `search`, `routing` | `node test/runner.mjs` — zero-dependency, auto-discovers `*.test.mjs`. |
| `npm run typecheck` | `bot`, `web`, `search`, `routing` | `tsc --noEmit`, `strict` + `noUncheckedIndexedAccess`. |
| `npm run dev` | `bot` | `wrangler dev --port 8787 --local`. |
| `npm run deploy` | `bot` | `wrangler deploy && node scripts/set-webhook.mjs`. |
| `npm run commands` | `bot` | `node scripts/register-commands.mjs`. |
| `npm run build` | `web` | `vite build` → `web/dist`. |
| `npm run build:harness` | `web` | `vite build --mode harness` → `web/dist-harness`. |
| `npm run capture` | `web` | `node scripts/capture.mjs`. |
| `npm run corpus` | `search` | `node scripts/gazetteer-corpus.mjs`. |
| `npm run corpus` | `routing` | `node scripts/route-corpus.mjs`. |
| `npm run fixtures` | `routing` | `node scripts/fetch-route-fixtures.mjs` (network — OSRM demo; maintainer tool). |
| `npm run glyphs` | `routing` | `node scripts/build-glyphs.mjs` — render `web/public/glyphs/*.png`. |
| `npm run build` | `theme` | `tailwindcss -i ./src/theme.css -o ./dist/rams.css --minify`. |
| `npm run send` | `theme` | Copy self-hosted `woff2` fonts into `dist/fonts/`. |
| `npm run basemap` | `theme` | `node basemap/build.mjs` — derive `basemap/liberty-rams.json` from tokens. |
| `npm run basemap:preview` | `theme` | `python3 -m http.server 8123` (blocking). |
| `npm run audit` | `theme` | `node ./scripts/audit.mjs ./dist/rams.css`. |
| `npm run capture` | `theme` | `node ./scripts/screenshot.mjs`. |
| `npm run test` | `theme` | `node ./scripts/audit.test.mjs`. |

Maintainer scripts **without** an npm alias (run with `node <path>`): the
road-graph track `routing/scripts/build-road-graph.mjs` and
`routing/scripts/upload-road-graph.mjs`, the dataset tools
`search/scripts/overpass-topup.mjs` and `search/scripts/json-to-sqlite.mjs`, and
the CPU ladder `routing/scripts/measure-route-cpu.mjs` (also invoked by
`budget-audit`'s route-CPU gate).

### Before you open a change

Run the four typechecks and the four test suites. They are fast and they are the
project's actual quality gates:

```bash
npm run bot:typecheck
npm run web:typecheck
npm run search:typecheck
npm run routing:typecheck
npm run bot:test
npm run web:test
npm run search:test
npm run routing:test
npm run audit        # only if you touched theme/ or any rendered CSS
```

`theme` has its own suite (`npm test -w theme` → `node ./scripts/audit.test.mjs`).
Note it has **no root passthrough script** — you must use the `-w theme` form to
run it, unlike the other four workspaces.

As a release gate, run the two consolidated audits (they print evidence lines per
gate; exit 2 means NOT RUN and is never a pass):

```bash
npm run privacy-audit           # add --live when credentials + a build exist
npm run budget-audit
```

---

## Code style

**There is no linter and no formatter configured in this repository.** No
ESLint, no Prettier, no Biome, no `.editorconfig`, no `lint` or `format` script
in any of the five `package.json` files, and no commit hooks (no Husky, no
`.git/hooks` wiring). If you add one, it becomes the project's standard
retroactively — but today style is a review-time convention, not an automated
check. What *is* mechanically enforced is TypeScript strictness and the gate
suites described below.

### TypeScript

All four TS workspaces (`bot`, `web`, `search`, `routing`) are strict beyond the
default. The settings that actually change how you write code:

| Setting | `bot` | `web` | `search` / `routing` | Why it matters |
| --- | --- | --- | --- | --- |
| `strict` | yes | yes | yes | No implicit `any`, strict null checks. |
| `noUncheckedIndexedAccess` | yes | yes | yes | Indexing an array/record yields `T \| undefined` — you must narrow. This is the single most common source of compile friction in this repo. |
| `verbatimModuleSyntax` | yes | yes | yes | Type-only imports must use `import type`. |
| `allowImportingTsExtensions` | yes | yes | yes | Import with explicit `.ts` extensions is allowed and is the house style. |
| `noEmit` | yes | yes | yes | `typecheck` is `tsc --noEmit`; bundling is wrangler's or Vite's job. |
| `target` / `lib` | ES2023 / ES2023 | ES2023 / ES2023 + DOM | ES2023 / ES2023 | No downleveling. The data planes are DOM-free. |
| `types` | `@cloudflare/workers-types` | `vite/client` | none | Determines which globals exist. `bot` has no DOM; `web` does; the data planes are V8-native. |
| `resolveJsonModule` | no | yes | yes | `web` imports the basemap JSON style; the data planes load their committed datasets via static JSON imports. |

`moduleResolution` is `"bundler"` in all four — deliberately not `node16`, because
the runtimes are bundler-hosted (wrangler / Vite) or Node type-stripping (the
corpus runners), not raw Node + CommonJS.

### House conventions observable in the source

- **Explicit `.ts` extensions on relative imports.** e.g. `import { strings } from
  "../src/i18n/strings.ts"`, `from "./harness.mjs"`. Data-plane consumers import the
  subpath with extension too (`@araharah/search/src/index.ts`) — a bare package
  specifier resolves to nothing (no `exports`/`main` field).
- **`.mjs` for scripts and tests, `.ts` for source.** Everything in
  `bot/scripts/`, `bot/test/`, `web/test/`, `web/scripts/`, `search/scripts/`,
  `search/test/`, `routing/scripts/`, `routing/test/`, `theme/scripts/`, and
  root `scripts/` is `.mjs` and runs under plain Node.
- **`node:` prefixed builtins** — `import { readFileSync } from "node:fs"`, never
  bare `"fs"`.
- **Heavy header comments.** Every script and several source modules open with a
  block comment stating what it is, which decision IDs it satisfies, and its
  known constraints. Match that when adding a file.
- **Named constants in SCREAMING_SNAKE for tunables** — `SESSION_TTL_SECONDS = 900`,
  `PIN_TTL_SECONDS = 300`, `GUIDANCE_SESSION_TTL_SECONDS = 7200`,
  `CARD_CADENCE_S = 240`. The privacy gate greps for this exact shape (see below).
- **Zero inline user-facing copy.** All strings live in `bot/src/i18n/strings.ts`
  and `web/src/i18n/strings.ts`, keyed by locale, with `en` and `ms` carrying
  identical key-sets. Gate: `COPY5 no shell module inlines copy`.
- **Structural interfaces for injection.** `KvLike`, `TelegramWebAppLike`,
  `acquireFix(deps, …)`, `createGuidanceWatch(geo, …)`, `HttpRoutingSourceOptions`
  — dependencies are passed in so tests can supply fakes without touching
  Workers types or `window`.
- **No runtime deps in the data planes.** `@araharah/search` and
  `@araharah/routing` are V8-native and dependency-free; `routing/scripts/` may
  use dev tools (`sharp` for glyph rendering) but the library code never does.

---

## Project conventions (the gates)

These are the rules the codebase enforces on itself. Each is a real test that
reads source or build artifacts — treat them as non-negotiable, because a change
that breaks one is a regression even if the behavior looks fine.

| Gate | Suite | Rule |
| --- | --- | --- |
| `PG1` | `bot/test/privacy.test.mjs` | Every `.put(` line in `kv/sessions.ts`, `kv/location-pin.ts`, `kv/guidance-sessions.ts`, and `webhook.ts` must carry `expirationTtl` **on the same line**, and the value must be a named `SCREAMING_SNAKE` constant — never an inline literal. No TTL-free write path can ship. The same law is asserted repo-wide by the `kv-ttl` gate in the consolidated privacy audit. |
| `PG2` | `bot/test/privacy.test.mjs` | The KV modules export nothing persistence-shaped: no `saveProfile`, `storeProfile`, `saveLocation`, `storeLocation`, `saveHistory`, `storeHistory`, `putHistory`, `setLocation`. |
| `GEO3` | `web/test/no-storage.test.mjs` | After stripping comments, no `web/src` file may reference `localStorage`, `sessionStorage`, `indexedDB`, `caches`, `CacheStorage`, `document.cookie`, `WebApp.DeviceStorage`, `WebApp.SecureStorage`, or `WebApp.CloudStorage`. Also no `serviceWorker.register`, `navigator.serviceWorker`, or `workbox`. The `storage-api` gate generalizes this repo-wide. |
| `WK5` | `bot/test/webhook.test.mjs` | An empty `WEBHOOK_SECRET` must fail the webhook **closed** with a constant 500, without running the bot or touching KV. |
| `CS4` | `bot/test/commands.test.mjs` | All replies go out with link previews disabled and nothing else attached; the command tree has no reply-menu or inline-button surface — except the two documented exceptions (the location reply keyboard and the `/cari` venue card). |
| `CS6` | `bot/test/commands.test.mjs` | The command stack registers exactly `/start`, `/mula`, `/help`, `/privacy`, `/privasi`, `/cari`, `/search`. |
| `COPY1` | `web/test/copy-gate.test.mjs` | `en` and `ms` carry identical key-sets (locale parity). |
| `COPY5` | `web/test/copy-gate.test.mjs` | No module under `web/src/ui/*.ts` or `web/src/main.ts` inlines copy strings. |
| `BA1`–`BA6` | `web/test/build-artifact.test.mjs` | The production bundle references no third-party CDN, self-hosts its `woff2` fonts, contains a hashed MapLibre worker chunk, carries the inlined Rams style JSON, and contains **no** Mock-Telegram installer or runner-page fetch stub in any emitted file. |
| `R12` | `web/test/guidance-replay.test.mjs` | The guidance state machine is pure and replay-verifiable: every behavior is decided in `guidance.ts`, and its structural case gates that the module contains no console, no document, no maplibre, no localStorage. |
| route-privacy | `bot/test/route-privacy.test.mjs` | The `/api/route` handler persists nothing and logs nothing beyond categories — the origin coordinate never touches storage or a log line. |
| audit exit codes | `theme/scripts/audit.mjs` | `0` clean, `1` off-token violations, `2` token-sheet drift. No silent passes. |

### The consolidated audits (release gates)

Two root tools carry the same laws beyond the suites — both are maintainer-time
repo tools (nothing in `bot/src`, `web/src`, `routing/src`, or `search/src`
imports them), both follow the same contract: one evidence line per gate, exit
`0` clean / `1` violations / `2` NOT RUN (environment drift — a skipped probe is
NEVER mistaken for a pass), category-only output (never a coordinate, id, token,
or payload). Both honor a `PRIVACY_AUDIT_ROOT` override and are cwd-independent,
and both double as the fork onboarding check.

**`npm run privacy-audit`** (`scripts/privacy-audit.mjs`, gates in
`scripts/lib/source-gates.mjs` + `scripts/lib/bundle-gates.mjs`):

| Gate | Rule |
| --- | --- |
| `storage-api` | The memory-only law, repo-wide. |
| `kv-ttl` | The PG1 same-line TTL law, repo-wide. |
| `log-vocabulary` | The D-14 category-only log law. |
| `runtime-hosts` | The POSITIVE fetch-host allowlist — no fetch outside it. |
| `bundle-telemetry` | The production `web/dist` scan — no analytics/beacon/telemetry. |
| `kv-expiry` / `asset-headers` (`--live`) | Live KV expiry metadata + cache headers, read verbatim. |

**`npm run budget-audit`** (`scripts/budget-audit.mjs`, gates in
`scripts/lib/budget-gates.mjs`):

| Gate | Rule |
| --- | --- |
| `route-cpu` | Re-runs the A\* CPU ladder (child process) — inside its budget or a documented, decided escalation. |
| `bundle-budget` | Route-payload gzip + whole-app bundle gzip ceilings. |
| `kv-writes` | Write classes + the cron's ZERO-writes law. |
| `subrequests` | The per-request-class subrequest inventory. |
| `golden-corpus` | Re-runs `routing:corpus` + `search:corpus`. |
| `cache-headers` (`--live`) | Observed cache headers, verbatim. |

The human record for both lives in `docs/BUDGETS.md` and
`docs/PRIVACY-AUDIT.md`.

The same privacy promise is asserted from both sides: the **bot** must never
write without a TTL, and the **web** client must have no storage surface at all.
If you add a persistence mechanism, these suites fail — which is the point.

### The three invariants worth internalizing

**Access control.** The `chat_id` for `/api/location`, `/api/location-fallback`,
and `/api/guidance` is *always* resolved from the session claim, never from
client input; locale comes from `claim.language_code`; the fallback request body
is never read and a guidance body's `chat_id` is structurally dropped. `/api/route`
uses the claim only as an identity gate and persists nothing about the caller.
If you add a route, derive identity the same way.

**Honest degradation.** Every failure is a labeled state, never a silent one and
never a fabricated value. A `null` heading hides the marker cone instead of
guessing; `getPin` range-validates so a corrupt record cannot fly the camera to
null island; the chat-pin poll is bounded at 60 s so `AWAITING PIN` cannot persist
forever; every source timeout resolves `null` so the chain always advances;
`bootMap()` returning `null` renders the shell with `data-map="absent"`; every
`/api/route` miss class answers `200 null` (the honest router-pending card); a
null road graph degrades a cron card to the street-less bare verb but still
sends. Copy along this pattern: if you cannot do the thing, say so in a state,
don't fake it.

**The backend ladders are import-site code.** Search and routing backends are
selected by constructing them at the import site — no env read, no config, no
registry. If you add a backend rung (e.g. engine B), it slots beneath the
existing seam and the ladder documentation updates in
`ARCHITECTURE.md`/`docs/SEARCH-QUALITY.md` — never a runtime switch.

### Design-token workflow

`theme/src/tokens.css` is the **single source of truth** for every color, spacing,
typography, and radius value in the project. It declares them in a Tailwind v4
`@theme static` block (55 `--color-*` tokens plus spacing and typography);
`static` forces every token into the compiled CSS so the package is consumable as
plain custom properties by anything, including the MapLibre basemap derivation.

Rules:

1. **Never hardcode a value that belongs to a token.** Not a hex, not a px
   padding, not a font stack. `npm run audit` will flag it in rendered CSS.
2. **Never restate token values in documentation.** `DESIGN.md` and other docs
   describe principles and point at the token package.
3. **Never edit `stitch_minimalist_route_navigator/`.** Those four mockups are
   read-only reference; `theme/src/theme.css` `@source`-scans them to compile
   their utility vocabulary, and `theme/scripts/screenshot.mjs` falls back to
   their committed `screen.png` on capture failure.
4. **Adding a token** means editing `tokens.css`, rebuilding (`npm run build -w
   theme`), and re-running `npm run audit`. If it is a cartographic color, also
   consider whether `theme/basemap/build.mjs` should derive it.
5. **`theme/src/theme.css`** is the entry stylesheet: it `@import`s tailwindcss,
   `tokens.css`, and `components.css`, declares seven self-hosted `@font-face`
   rules from `theme/fonts/` (no Google Fonts CDN), scopes class generation
   with explicit `@source` lines (the four mockups are the allowed utility
   sources; `@source not "../scripts"` and `@source not "../basemap"` exclude
   prose), and defines the `--shell-bg` / `--shell-on-surface` theme slots.
6. **The theme-slot machine.** Light/dark is a slot switch, not a color import:
   `web/src/telegram/theme.ts` reads Telegram's signal (or the `header_bg_color`
   luminance fallback) and its `applyTheme`'s ONLY statement is the
   `data-tg-theme` attribute set — CSS custom properties re-slot between the two
   Rams token pairs and the MapLibre style is never re-set. `web/test/theme.test.mjs`
   greps that invariant; don't fight it.
7. **`theme/basemap/build.mjs`** forks OpenFreeMap `liberty` and derives every
   cartographic color from `tokens.css` via `desaturate(...)`, with an accent
   guard that fails the build if `#EB8008`, `#ED3F1C`, or `#736B1E` leak into any
   layer. `building-3d` is stripped (no faux 3D).

---

## Branch and commit conventions

### Branches

The repo's only active branch is `main` (there is a stray `master` but it is not
the active branch; the remote is `origin/main`), and there is **no remote branch
convention documented** — no `CONTRIBUTING.md`, no PR template, no CI config (no
`.github/`, no `.gitea/`). In practice, work lands on `main` via atomic commits
rather than long-lived feature branches. If you prefer branches, `feat/`,
`fix/`, and `docs/` prefixes match the commit vocabulary below.

### Commit messages

The convention is **conventional-commit style with a phase-scoped type**:
`type(phase): subject`. The type is one of `feat`, `fix`, `docs`, `chore`, `test`.
The scope in parentheses is a phase identifier, sometimes with a sub-task
(`03-04`). Examples straight from `git log`:

```
feat(03-03): status strip, state cards, recenter control, boot choreography — map-first, D-09 staged states
fix(03-04): load telegram-web-app.js in head — production WebApp was never defined
docs(03-04): log debug round 5 — diagnostic probe armed
test(02-01): hand-rolled harness + RED initData vector suite (D-12, TDD RED)
chore(03-01): lockfile resolution for the web workspace
fix(02-02): ... (when the scope names the phase area rather than a number)
```

The subject is lowercase after the colon, imperative, and — the house habit —
carries an em-dash clause explaining the *why* or the observable failure it fixes
("production WebApp was never defined (no initData…)"). Reference decision IDs
(`D-09`, `WR-03`, `PRIV-02`) are appended in parentheses when relevant.

Keep commits atomic: the log shows one concern per commit, frequently a
`fix(...)` immediately after the `docs(...)` log entry that motivated it.

---

## Pull requests

**There is no PR process configured** — no `.github/PULL_REQUEST_TEMPLATE.md`, no
CONTRIBUTING file, no CI, no required reviewers. Given the private single-branch
setup, changes are typically committed straight to `main`. If you do open a PR,
match what the project actually relies on:

- **Run the gates** and paste the output: all four typechecks, all four test
  suites, `npm run audit` if any rendered CSS or theme changed, and — for anything
  privacy- or budget-relevant — `npm run privacy-audit` / `npm run budget-audit`.
- **Explain the observable before/after**, following the commit-subject habit
  (what was broken, what it does now).
- **Call out gate-relevant surface**: if you touched a KV write, `web/src`
  persistence, the command surface, the i18n strings, or the guidance envelope,
  say which gates you re-verified (`PG1`, `GEO3`, `CS6`, `COPY1`, `R12`…).
- **Include screenshots** for any Mini App change — `npm run web:build:harness
  && npm run web:capture` produces the current states.
- **Do not commit build output.** `theme/dist`, `web/dist`, `web/dist-harness`,
  `routing/data/*.bin`, and the `screenshots/` directories are gitignored by
  design; they are regenerated at build time.

---

## Committing generated artifacts

`dist/` and the screenshot directories are **never committed**. This is a
deliberate rule, called out in `.gitignore`: the web build consumes
`theme/dist/rams.css` at build time without vendoring, so a committed
`theme/dist` would go stale. Always rebuild (`npm run build`) rather than
expecting a checked-in artifact.

`routing/data/kl-roadgraph.v1.bin` is likewise a build artifact (`routing/data/.gitignore`
ignores `*.bin` — it is ODbL-derived and per-fork), and `web/dist-harness/`
exists only for capture runs.

`.planning/` is git-TRACKED (the ignore line is commented out; planning artifacts are part of the repo) (local-only planning docs), as is `bot/.dev.vars`
and `bot/.wrangler/`.