fix(worktrees): retain evidence evicted before the first Git catalog

[Juliusolsson05]

Problem

LiveWorktreeReconciler.observe folds records evicted from the 500-record live window into the baseline through foldRaw, and foldRaw skips every non-worktree-state record while the cwd has no Git catalog. A session that buffers more than 500 relevant records before the first catalog reply loses attribution for all but the newest 500. Surfaced by the independent review of #808 and filed as #822; pre-existing on main.

Change

• Records evicted before a catalog exists go to a second list, deferredRaw, bounded by the same recentRawLimit.
• The first rebuild() that has a catalog folds the deferred list into the baseline in arrival order.
• Hydration and history adoption release tracker keys for deferred records too, so they cannot double-count.
• summarize() reports deferredEvidenceCount and droppedBeforeCatalog so the debug panel can say when attribution is still incomplete.

Tests

• Recorded Claude fixture, window of one, catalog pending: the first write is evicted, deferred, and present in the timeline after the catalog arrives (fails on main with one write).
• Window of one, catalog never arrives, three records: one live, one deferred, one counted as dropped.

Verification

npm run typecheck, the work-context unit suite, npm run check:worktree-live-fixtures.

Fixes #822

🤖 Generated with Claude Code

https://claude.ai/code/session_013SULm3ApxebET2a8eLxKHd