[markmnl]

Adds the client API that FMSG-006 left to a future FMSG-003 revision. It is optional as a group (route and event together):

• POST /fmsg/:id/indicate {emoji, ttl}:
  • Only participants may use it, and the message must be sent and not terminal (409 otherwise).
  • The emoji is validated as for react. An empty emoji or ttl 0 clears. ttl defaults to 6 and is clamped to INDICATOR_TTL_MAX.
  • It answers 202 with no body. Nothing is stored.
  • The server delivers it to connected participants and, when it is also the participant's host, sends it on per FMSG-006.
  • The server may drop more than one per second per identity and message, but never clears.
  • Clients should let users turn off composing indicators, and must not send 👀 unless the user opted in.
• indicator WebSocket event: {id, root_id, from, emoji, ttl}. No Web Push or other durable notification.
• Other changes: scope, references, route summary and revision table updated. FMSG-006 now points here.

Implemented in markmnl/fmsg-webapi#64.

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