matt 6df422ecef docs(03-01): complete context snapshot and restore plan

- Create comprehensive SUMMARY.md with implementation details
- Update STATE.md: Phase 3 Plan 1 complete (75% overall progress)
- Document key decisions: 5-min TTL, transient state exclusion, tab validation
- Record metrics: 7 min duration, 3 tasks, 4 files created, 494 tests passing

2026-02-12 01:42:43 +00:00

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Project State

Project Reference

See: .planning/PROJECT.md (updated 2026-02-12)

Core value: Users can seamlessly switch between local and SSH workspaces without losing state, and SSH sessions actually load their conversation history. Current focus: Phase 1 complete — ready for Phase 2

Current Position

Phase: 3 of 4 (State Management) Plan: 1 of 1 Status: Phase 03 complete - ready for Phase 04 Last activity: 2026-02-12 - Completed 03-01 (Context snapshot and restore system)

Progress: [███████░░░] 75.0% (3.0/4 phases)

Performance Metrics

Velocity:

Total plans completed: 5
Average duration: 5 min
Total execution time: 0.52 hours

By Phase:

Phase	Plans	Total	Avg/Plan
01 Provider Plumbing	1	4 min	4 min
02 Service Infrastructure	3	12 min	4 min
03 State Management	1	7 min	7 min

Recent Trend:

Last 5 plans: 4, 6, 2, 7
Trend: Stable (snapshot/restore complexity balanced by clear requirements)

Updated after each plan completion

Accumulated Context

Decisions

Decisions are logged in PROJECT.md Key Decisions table. Recent decisions affecting current work:

ServiceContextRegistry in main process (centralizes context lifecycle)
Snapshot/restore for Zustand state (instant switching without refetching)
Workspace indicators in sidebar + status bar (VS Code model)
SSH watchers stay alive in background (real-time updates for all workspaces)
Added getFileSystemProvider() getter to ProjectScanner for consistent provider access (01-01)
Threaded provider through all parseJsonlFile() call sites instead of relying on optional parameter fallback (01-01)
Refactored SubagentDetailBuilder to accept fsProvider and projectsDir as explicit parameters (01-01)
ServiceContext bundles all session-data services for single workspace isolation (02-01)
dispose() separate from stop() - stop pauses (reversible), dispose destroys (permanent) (02-01)
removeAllListeners() called LAST in dispose() to prevent events during cleanup (02-01)
File watcher event rewiring via exported onContextSwitched callback from index.ts (02-02)
SSH handler dynamically imports onContextSwitched to avoid circular dependencies (02-02)
Context ID for SSH uses simple format: ssh-{host} (02-02)
Destroy existing SSH context on reconnection to same host (02-02)
[Phase 02-03]: SSH profiles stored in ConfigManager config.ssh.profiles for persistence
[Phase 02-03]: lastActiveContextId persisted in config for app restart restoration
[Phase 03-01]: 5-minute TTL for snapshot expiration (balances staleness vs utility)
[Phase 03-01]: Exclude all transient state from snapshots (loading flags, errors, Maps/Sets)
[Phase 03-01]: Validate restored tabs against fresh project/worktree data from target context
[Phase 03-01]: Full-screen overlay prevents stale data flash during context transitions

Pending Todos

None yet.

Blockers/Concerns

Phase 1:

✓ RESOLVED: SessionParser, SubagentResolver, and SubagentDetailBuilder now receive FileSystemProvider correctly (01-01)
Need to test SSH session loading and subagent drill-down thoroughly before proceeding to infrastructure changes (deferred to end-to-end testing)

Phase 2:

ServiceContextRegistry pattern is novel for this codebase (no existing examples) - may need proof-of-concept validation
EventEmitter listener cleanup must be bulletproof - memory leaks from orphaned listeners can consume 50-100MB per switch

Phase 3:

✓ RESOLVED: 5-minute TTL implemented with configurable version checking (03-01)
✓ RESOLVED: Snapshot validation filters invalid tabs and ensures at-least-one-pane invariant (03-01)

Phase 4:

Context switcher placement in sidebar needs to fit with existing SidebarHeader without disrupting current layout

Session Continuity

Last session: 2026-02-12 Stopped at: Completed 03-01 (Context snapshot and restore system) — Phase 03 complete Resume file: None

Created: 2026-02-12 Last updated: 2026-02-12 after completing 03-01-PLAN.md

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