Blocker fix: send --verify now captures a BEFORE snapshot immediately
before the send and an AFTER snapshot after the delay, then uses
classifySendResult(before, after) to classify. A wedged pane showing
stale non-empty content is no longer falsely reported as 'accepted' —
BEFORE==AFTER maps to 'unverifiable' (exit 1, "no pane change after
send"). Blank AFTER still fails closed as 'unverifiable'. Only
AFTER != BEFORE without a draft suffix counts as 'accepted' (exit 0).
Should-fix: agent watch now uses a GROUPED VIEWER SESSION instead of a
bare 'tmux attach -r' against the agent session. A bare attach lets the
viewer terminal shrink the agent's window; a grouped session has
independent sizing so the agent's window is never affected.
Sequence: new-session -d -t '=<agent>' -s '<agent>-watch-<pid>' (runner),
attach -r to viewer session (interactiveRunner), kill-session on detach
(runner). New builder functions exported: buildAgentWatchCreateViewerCommand,
buildAgentWatchAttachCommand, buildAgentWatchKillViewerCommand,
buildViewerSessionName. buildAgentWatchCommand kept but deprecated.
New exports: classifySendResult(before, after) — the testable classifier.
Tests added:
- classifySendResult unit suite (6 cases): accepted/draft/unverifiable/
stale-pane/both-blank/before-blank-after-response
- send --verify regression: stale (before==after non-empty) => exit 1
- send --verify regression: blank AFTER => exit 1
- send --verify regression: draft after pane change => exit 1
- send --verify regression: changed non-draft => exit 0
- send --verify: 3-call sequence assertion (before-capture, send, after-capture)
- watch dispatch: grouped viewer session created/attached/killed; no bare
attach against agent session; viewer name matches <agent>-watch-<pid>
PRD Known-limitations updated: pane-change check rationale, Phase-3
heartbeat-ack requirement, grouped-session watch design.
All gates pass: pnpm typecheck, pnpm lint, pnpm --filter @mosaicstack/mosaic test
(382 tests, 74 fleet), prettier --check.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RMoEx7hfdFGjUiCHuN1RRi
8466ca2d81