feat(06-08): the ?drive= fixture-replay knob — the D-16 browser leg's fix source

- ?drive=<name> replaces navigator.geolocation with a replay source
  streaming a committed drive fixture (web/test/fixtures/drives/*.json)
  through the LIVE shell: the real pump arms the real
  createGuidanceWatch against it — no test-only bypass of validation
- the replay clock starts lazily at the first watchPosition arm (the
  route draw — nothing emitted before a consumer exists) and plays
  REAL-TIME: the machine's grace/storm clocks read wall time
- window.__ARAHARAH_DRIVE = { pause(), resume(), name }: pause freezes
  emission mid-stream (the capture legs' freeze for scripted taps and
  the REROUTING window), resume continues; the machine's wall clock
  keeps running across a pause (documented harness semantics)
- unknown drive name -> one honest token (ARAHARAH-DRIVE
  state=unknown) + the default geolocation stays — never a crash,
  never arbitrary data (T-06-08 Tampering mitigation); slug guard on
  the name, defensive fixture shape check
- import.meta.glob pattern is ROOT-ABSOLUTE (/test/fixtures/drives/*.json
  — Vite 8's importGlob matches no relative pattern escaping src/,
  verified by the dev-server probe); fixtures inline into the harness
  bundle only — production tree-shake verified clean in BOTH directions
- BA5 posture held: production scan clean, harness bundle carries the
  replay; 147/147 web tests, typecheck clean

web/index.html

@@ -9,7 +9,7 @@
 <body>
   <div id="app"></div>
   <script type="module">
-    /* D-11 Mock-Telegram profile: ?mock=android|ios|tdesktop|macos|web  +  ?scheme=light|dark  +  ?pin=1  +  ?locale=en|ms  +  ?fixdelay  +  ?sessiondelay  +  ?dest=<id>  +  ?fixpair=<pair-id>
+    /* D-11 Mock-Telegram profile: ?mock=android|ios|tdesktop|macos|web  +  ?scheme=light|dark  +  ?pin=1  +  ?locale=en|ms  +  ?fixdelay  +  ?sessiondelay  +  ?dest=<id>  +  ?fixpair=<pair-id>  +  ?drive=<fixture-name> (06-08: the drive replay is read inside the mock module — installMockWebApp replaces navigator.geolocation with the committed fixture's stream)
        Harness-only: served from web/dist-harness, never deployed.
        The WHOLE block below is inside `if (__ARAHARAH_HARNESS__)` — Vite's `define`
        replaces that identifier with `false` in the production build, so the branch is

web/src/mock/telegram-mock.ts

@@ -29,6 +29,25 @@
  * tests read (the `__events` / `__backButtonClicks` exposure precedent).
  * The mock's initData is HMAC-unvalidated by design — the runner page
  * stubs `/api/session`.
+ *
+ * The ?drive= replay knob (06-08, D-16's browser leg): `?drive=<name>` makes
+ * THIS mock replace navigator.geolocation with a replay source that streams
+ * a committed drive fixture (web/test/fixtures/drives/*.json — the same JSON
+ * the Node replays prove the brain with) through the LIVE shell — the real
+ * pump, real builders, real camera consume the fixes via the real
+ * createGuidanceWatch. The replay clock starts lazily at the FIRST
+ * watchPosition arm (the route draw — the pump's ensureWatch), so no fix is
+ * ever emitted before something consumes it, and plays REAL-TIME: the
+ * machine's grace/storm clocks read wall time (route.ts's now()), so a
+ * compressed playback would desync them. window.__ARAHARAH_DRIVE.pause()/
+ * resume() freeze/resume emission mid-stream — the capture script's freeze
+ * for stable scripted taps (confirm/tripend legs) and the REROUTING leg's
+ * window. A pause stops EMISSION only; the shell's wall clock keeps running
+ * (grace windows inflate across a pause — legs that pause close before any
+ * machine timing matters). Console emits NOTHING per fix; an unknown drive
+ * name is the knob's one honest token (`ARAHARAH-DRIVE state=unknown`) and
+ * falls back to the default geolocation — never a crash, never replayed
+ * arbitrary data (the fixture/kernel mismatch mitigation, T-06-08).
  */
 import type { TelegramWebAppLike, HomeScreenStatus } from "../telegram/webapp.ts";
 
@@ -162,6 +181,189 @@ function buildMockInitData(languageCode?: string, startParam?: string | null): s
   return startParam ? `${base}&start_param=${encodeURIComponent(startParam)}` : base;
 }
 
+/* ————— the ?drive= fixture-replay source (06-08, D-16's browser leg) ————— */
+
+/** A committed drive fixture's structural minimum (the 06-02 replay shape:
+ *  { _notice, pairId, maneuverIdx, kinds, fixes[] } with Fix-shaped fixes). */
+interface DriveFixture {
+  fixes: Array<{ lat: number; lng: number; accuracyM?: number | null; headingDeg?: number | null; ts: number; source?: string }>;
+}
+
+/** The pause/resume surface the capture script drives (window.__ARAHARAH_DRIVE). */
+export interface DriveReplayControls {
+  /** Freeze the replay clock mid-stream — emission stops until resume(). */
+  pause(): void;
+  /** Continue mid-stream: unpaused wall time resumes driving the schedule. */
+  resume(): void;
+  readonly name: string;
+}
+
+declare global {
+  interface Window {
+    /** Installed ONLY when ?drive= names a committed fixture — the capture
+     *  script's freeze surface (and its diagnostics: .name). */
+    __ARAHARAH_DRIVE?: DriveReplayControls;
+  }
+}
+
+/** Drive names are slugs (the pairId/destinationId pattern — bounds the
+ *  lookup against hostile query strings before the fixture record is read). */
+const DRIVE_NAME_PATTERN = /^[a-z0-9-]{1,64}$/;
+
+/** The committed D-16 drive replays, inlined into the HARNESS bundle at build
+ *  time (eager glob, the route-profiles BA-exclusion posture: this module is
+ *  imported by main.ts's dead harness branch and tree-shaken from production —
+ *  BA5 asserts the absence). The pattern is ROOT-ABSOLUTE (/test/... — Vite 8's
+ *  importGlob matches no relative pattern that escapes src/; verified by the
+ *  06-08 dev-server probe). */
+const DRIVE_FIXTURES = import.meta.glob<unknown>("/test/fixtures/drives/*.json", {
+  eager: true,
+  import: "default",
+});
+
+/** Defensive shape check (the fixture-source isUsablePair posture): a
+ *  malformed drive degrades to the honest unknown-fallback, never a crash
+ *  and never a partial replay (T-06-08's Tampering mitigation). */
+function isDriveFixture(value: unknown): value is DriveFixture {
+  if (value === null || typeof value !== "object") return false;
+  const fixes = (value as { fixes?: unknown }).fixes;
+  if (!Array.isArray(fixes) || fixes.length < 2) return false;
+  return fixes.every((f) => {
+    if (f === null || typeof f !== "object") return false;
+    const p = f as { lat?: unknown; lng?: unknown; ts?: unknown };
+    return (
+      typeof p.lat === "number" &&
+      Number.isFinite(p.lat) &&
+      typeof p.lng === "number" &&
+      Number.isFinite(p.lng) &&
+      typeof p.ts === "number" &&
+      Number.isFinite(p.ts)
+    );
+  });
+}
+
+function driveFixtureByName(name: string): DriveFixture | null {
+  if (!DRIVE_NAME_PATTERN.test(name)) return null;
+  const hit = DRIVE_FIXTURES[`/test/fixtures/drives/${name}.json`];
+  return isDriveFixture(hit) ? hit : null;
+}
+
+/** Position assembled from a fixture fix at a replayed wall timestamp. The
+ *  watch (createGuidanceWatch) normalizes exactly the four consumed fields;
+ *  the GeolocationPosition type's remaining members are cast — the harness
+ *  source is the fixture itself, not a lying platform. */
+function replayedPosition(f: DriveFixture["fixes"][number], timestamp: number): GeolocationPosition {
+  return {
+    coords: {
+      latitude: f.lat,
+      longitude: f.lng,
+      accuracy: f.accuracyM ?? undefined,
+      altitude: null,
+      altitudeAccuracy: null,
+      altitudeAngle: null,
+      heading: f.headingDeg ?? undefined,
+      speed: null,
+    },
+    timestamp,
+  } as unknown as GeolocationPosition;
+}
+
+/**
+ * Replace navigator.geolocation with the drive replay (harness-only): the
+ * REAL pump arms its REAL watch against this object, so the shell consumes
+ * the committed stream through the unmodified D-15 throttle — replay proves
+ * the shell, never bypassing it (the trust boundary's law).
+ *
+ * Clock semantics: the schedule is real-time (offset = fix.ts − fixes[0].ts;
+ * a 200ms tick delivers every fix whose offset has elapsed). pos.timestamp
+ * is t0 + offset so the machine's now()-anchored windows stay aligned with
+ * the fixes that drive them. Exhaustion stops the timer; a later re-arm
+ * delivers nothing (the drive is over).
+ */
+function installDriveReplay(name: string, fixture: DriveFixture): DriveReplayControls {
+  const fixes = fixture.fixes;
+  const first = fixes[0]!;
+  const offsets = fixes.map((f) => Math.max(0, f.ts - first.ts));
+  let clockStart: number | null = null; // performance.now() at the first watch arm
+  let wallT0 = 0; // Date.now() at the same instant — pos.timestamp = wallT0 + offset
+  let pausedAt: number | null = null;
+  let pausedTotal = 0;
+  let delivered = 0;
+  let nextId = 0;
+  let timer: ReturnType<typeof setInterval> | null = null;
+  const sinks = new Map<number, (pos: GeolocationPosition) => void>();
+
+  const elapsedMs = (): number => {
+    if (clockStart === null) return -1;
+    const nowP = performance.now();
+    return (nowP - clockStart) - pausedTotal - (pausedAt !== null ? nowP - pausedAt : 0);
+  };
+  const stopTimer = (): void => {
+    if (timer !== null) {
+      clearInterval(timer);
+      timer = null;
+    }
+  };
+  const tick = (): void => {
+    const e = elapsedMs();
+    if (e < 0) return;
+    while (delivered < fixes.length) {
+      const offset = offsets[delivered]!;
+      if (offset > e) break;
+      const fix = fixes[delivered]!;
+      const pos = replayedPosition(fix, wallT0 + offset);
+      for (const sink of sinks.values()) sink(pos);
+      delivered += 1;
+    }
+    if (delivered >= fixes.length) stopTimer(); // fully replayed — the drive is over
+  };
+  const ensureTimer = (): void => {
+    if (timer === null && delivered < fixes.length) timer = setInterval(tick, 200);
+  };
+
+  const fakeGeo = {
+    getCurrentPosition(success: PositionCallback, _error?: PositionErrorCallback | null, _opts?: PositionOptions): void {
+      // the chain's LINK-2 shape (unused while the Telegram mock serves LINK 1):
+      // the drive's FIRST fix, at wall-now, like a real one-shot read
+      const f = first;
+      setTimeout(() => success(replayedPosition(f, Date.now())), 0);
+    },
+    watchPosition(success: PositionCallback, _error?: PositionErrorCallback | null, _opts?: PositionOptions): number {
+      const id = ++nextId;
+      sinks.set(id, success);
+      if (clockStart === null) {
+        clockStart = performance.now();
+        wallT0 = Date.now();
+      }
+      ensureTimer(); // the first arm starts the clock; re-arms resume delivery
+      return id;
+    },
+    clearWatch(id: number): void {
+      sinks.delete(id);
+      if (sinks.size === 0) stopTimer(); // the pump stopped the watch — the replay stops with it
+    },
+  };
+  Object.defineProperty(navigator, "geolocation", { value: fakeGeo, configurable: true });
+
+  const controls: DriveReplayControls = {
+    get name(): string {
+      return name;
+    },
+    pause(): void {
+      if (pausedAt === null) pausedAt = performance.now();
+    },
+    resume(): void {
+      if (pausedAt !== null) {
+        pausedTotal += performance.now() - pausedAt;
+        pausedAt = null;
+      }
+      ensureTimer();
+    },
+  };
+  window.__ARAHARAH_DRIVE = controls;
+  return controls;
+}
+
 export function installMockWebApp(options: MockOptions = {}): TelegramWebAppLike {
   const version = options.version ?? "8.0";
   const telegramFix = options.telegramFix ?? null;
@@ -250,6 +452,22 @@ export function installMockWebApp(options: MockOptions = {}): TelegramWebAppLike
   installed = fake;
   const w = window as unknown as { Telegram?: unknown };
   w.Telegram = { WebApp: fake };
+  // The ?drive= replay knob (06-08): read from location.search HERE — the
+  // mock module is the harness surface, so the knob rides every install path
+  // (the runner page's profile install AND main.ts's plain-dev fallback)
+  // without a new carrier. Unknown name → one honest token + the default
+  // geolocation stays; never a crash, never replayed arbitrary data.
+  let driveName: string | null = null;
+  try {
+    driveName = new URLSearchParams(window.location?.search ?? "").get("drive");
+  } catch {
+    driveName = null;
+  }
+  if (driveName !== null) {
+    const fixture = driveFixtureByName(driveName);
+    if (fixture === null) console.log("ARAHARAH-DRIVE state=unknown");
+    else installDriveReplay(driveName, fixture);
+  }
   return fake;
 }