docs(04): research phase domain — destination search + KL gazetteer

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Phase 4 research: in-Worker SearchSource over a curated KL gazetteer.

Two critical platform findings:
- Telegram start_param is NEVER delivered to inline web_app buttons
  (direct links + attachment menu only). The destination id must ride
  as a URL query param on the button's URL; D-11's substance preserved.
- beforeinstallprompt never fires in a WebView. ONBD-03 must use
  Telegram's native WebApp.addToHomeScreen(); iOS status is always
  "unknown" by platform design.

Benchmarked the CPU budget: naive full-corpus Damerau is 52ms at
D-07's max scale vs the 10ms Workers Free limit. Exact-hash-first +
token-prefiltered residual is 0.0003ms.

Also: Phase 2 CS3/CS4/CS5 gates need declared amendments; ODbL
attribution obligation for the OSM-derived gazetteer.

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