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Taylor HoandCarl 2f132519c6 feat(composer): capability-based pill partition keeps pills through the turn-end gap

The composer strip's pill-vs-typing-group partition keyed on signal
source: any typing-fallback agent went to the merged typing group. An
agent whose observer turn just completed but who was still typing
therefore flipped partitions — its pill exited and a new typing-group
item entered at the trailing slot — and re-typing after a finished turn
mounted a group item instead of relighting the pill.

Partition on capability instead: an agent renders as a pill when there
is a session worth hovering and opening — an active observer turn, or a
headline-able transcript for the channel left behind by a prior turn.
Only an agent's first-ever activity in a channel can now start in the
typing group; every later working↔typing transition is an in-place pill
relabel (the "is typing…" override from cf6014de9).

- desktop/src/features/channels/ui/composerLiveActivity.ts: add pure
  partitionComposerWorkingAgents helper (injected getWorkingSource /
  getTranscript readers, mirrors deriveAgentWorkingOrder's style);
  pill-worthiness = source !== "typing" OR deriveActivityPillLabel
  non-null, so lifecycle-noise-only transcripts ("Turn started" seeds)
  still fold into the group
- desktop/src/features/channels/ui/ChannelComposerActivityRow.tsx:
  partition snapshot now subscribes to BOTH the working signal and the
  observer store (a transcript landing must be able to promote a typing
  agent); rename observerWorkingPubkeys → pillBotPubkeys to match the
  capability semantics
- desktop/src/features/channels/ui/composerLiveActivity.test.mjs: six
  new tests — observer always pills, transcript-less typing groups,
  turn-end gap keeps the pill, lifecycle-noise-only transcripts group,
  channel scoping, mixed-roster order preservation
- desktop/src/features/channels/ui/BotActivityBar.tsx +
  desktop/src/features/agents/debug/README.md: docs updated to the
  capability partition

E2E: shows-and-clears, composer-does-not-shift, typing-group-in-strip,
typing-avatars, and the pill hover-freeze suite all pass (8/8 smoke).

Co-authored-by: Taylor Ho <taylorkmho@gmail.com>
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>

2026-08-05 16:42:01 -07:00