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feat(index): seed worktree indexes from sibling to skip full re-embedding (#52)

When using git worktrees, lumen now detects sibling worktree indexes and
copies the most recent one as a seed before running the normal merkle diff.
This turns a full re-index (minutes of embedding) into an incremental
update (seconds), since worktrees typically share 95%+ of files.

New packages:
- internal/git: worktree detection (IsWorktree, CommonDir, ListWorktrees)
- internal/config: FindDonorIndex searches siblings for existing indexes
- internal/index: SeedFromDonor does atomic SQLite copy with WAL checkpoint

Integration points:
- cmd/stdio.go: seeds before NewIndexer in getOrCreate()
- cmd/hook.go: reports sibling availability in session context

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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