feat(07-05): the known-limitations document (D-08) + the /help pointer line (en+ms)

- docs/KNOWN-LIMITATIONS.md — new, for drivers AND forks: OSM data gaps,
  the c3 cross-metro CPU degradation (2-8 ms short / p95 38-93 ms cross-metro,
  measure-route-cpu.mjs LADDER HISTORY as evidence, ALT as the committed lever,
  Workers Paid rejected on the $0 mandate), the /cari menu defect + the
  type-the-command workaround, the beta-quality statement, the roadmap
  pointers (WASM-router / ALT / engine B — none in this release), the
  privacy paragraph, and the fork-facing audit commands
- strings.ts helpMenu (en+ms): ONE pointer line each, not /-prefixed so the
  CS5 menu parse ignores it; URL is the repo's actual remote deep link
  (http://gitmirah:3000/c-fu/arah2/src/branch/main/docs/KNOWN-LIMITATIONS.md),
  identical in both locales — single-copy law (D-05)
- suite 126/126, CS5 green

bot/src/i18n/strings.ts

@@ -92,7 +92,7 @@ export const strings: Record<Locale, BotStrings> = {
     privacyNotStored:
       "What araharah never keeps: your location, your routes, your trip history, any profile about you.",
     helpMenu:
-      "Commands:\n/help — How araharah works and what it keeps\n/privacy — What araharah stores and never stores\n/cari — Search for a destination in the KL metro",
+      "Commands:\n/help — How araharah works and what it keeps\n/privacy — What araharah stores and never stores\n/cari — Search for a destination in the KL metro\nKnown limits: http://gitmirah:3000/c-fu/arah2/src/branch/main/docs/KNOWN-LIMITATIONS.md",
     awaitingPin: "Send me a pin in this chat and I'll use it as your starting point.",
     shareLocationButton: "Share my location",
     pinReceived: "Got it — your starting point is set.",
@@ -130,7 +130,7 @@ export const strings: Record<Locale, BotStrings> = {
     privacyNotStored:
       "Yang araharah tidak pernah simpan: lokasi anda, laluan anda, sejarah perjalanan anda, apa-apa profil tentang anda.",
     helpMenu:
-      "Arahan:\n/help — Cara araharah berfungsi dan apa yang ia simpan\n/privacy — Apa yang araharah simpan dan tidak pernah simpan\n/cari — Cari destinasi di kawasan KL",
+      "Arahan:\n/help — Cara araharah berfungsi dan apa yang ia simpan\n/privacy — Apa yang araharah simpan dan tidak pernah simpan\n/cari — Cari destinasi di kawasan KL\nHad panduan: http://gitmirah:3000/c-fu/arah2/src/branch/main/docs/KNOWN-LIMITATIONS.md",
     awaitingPin: "Hantar saya pin dalam chat ini dan saya akan gunakannya sebagai titik mula anda.",
     shareLocationButton: "Kongsi lokasi saya",
     pinReceived: "Baik — titik mula anda sudah ditetapkan.",