fix(boom): settle days that close short of a full podium

[zkrige]

Pre-existing bugs on master, separate from #3. None of these are fixed by #3 either.

The main one

A day only announced once every required game had 3 unique entrants. A quiet :hadeda-boom: left the day, and that week's crown, stalled permanently. No podium, no crown, no recovery path.

Now a day settles when all games fill or when its noon window closes at 13:00 local. Games with 1-2 entrants keep 3/2 scoring; an empty game renders — no entries.

Trigger is the next message in the channel, @bot leaderboard, and a 60s sweep. Bounded by ANNOUNCE_BACKFILL_DAYS = 2 so deploying this cannot flood the channel with podiums for days that stalled months ago.

Also fixed

• setCrown ran before chat.postMessage, and markCrowned was skipped when the post threw. A rate-limited crown post recorded a king nobody was told about, unrecoverably.
• markCrowned ran even when the leaderboard was empty, permanently marking an unplayed week as crowned.
• The weekend/holiday "Boom isn't played today" notice fired once per poster.
• Unreachable !inWindow branch in the second clown check (the first check already returned).
• Announce path guarded by an in-flight date set so concurrent deliveries cannot double-post.

Verification

• 7 new regression tests. 5 of them fail on master, all 35 pass here.
• tsc --noEmit clean.

Conflicts with #3

This touches the same announce path #3 rewrites, so they will conflict. #3 still has the short-podium stall (resolveGame never marks a zero-entrant game resolved, so announceDay returns early forever), so whichever lands second needs that carried across.

Docs updated from source: README, docs/OPERATIONS.md, docs/TESTING.md.

https://claude.ai/code/session_01VFFB7rybFHMqXVPYbFgCb1

[coderabbitai]

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