v0.51.0

Changelog

• 1577514 feat: add local session state store (td-3d427b)
• ee5984d feat: add worktree identity to sessions (td-83cfc9)
• 34252e7 feat: key sessions by context_id for sub-agent independence (td-64dc09)
• fceccc7 feat: retry auto-sync push with bounded backoff + surface stranded changes
• 6c6feac feat: use session_state for CLI current state (td-e2f1ab)
• 95251d3 feat: use session_state for serve focus (td-dd7a11)
• 666c807 fix: call show RunE from resume (td-e2f1ab)
• fd18a34 fix: keep worktree metadata local in work session sync (td-83cfc9)
• 2a0c173 fix: reduce handoff autosync stalls
• d43f359 fix: scrub local-only fields from server sync events (td-83cfc9)
• 856330c fix: scrub local-only fields from sync conflicts (td-83cfc9)