docs(04-02): complete matrix context commands plan

- add phase summary with verification and deviations

.planning/phases/04-matrix-mvp-shared-agent-context-and-context-management-comma/04-02-SUMMARY.md

@@ -0,0 +1,41 @@
+# Phase 04 Plan 02: Matrix Context Commands Summary
+
+## Outcome
+
+Added Matrix context management for `!save`, `!load`, `!reset`, and `!context`, plus
+pending-state interception in the Matrix bot and prototype-state tracking for saved
+sessions, current session, and last token usage.
+
+## Commits
+
+- `2720ee2` `feat(04-02): extend prototype and matrix pending state`
+- `b52fdc4` `feat(04-02): add matrix context management commands`
+
+## Verification
+
+- `pytest tests/platform/test_prototype_state.py -q`
+- `pytest tests/adapter/matrix/test_context_commands.py tests/platform/test_prototype_state.py -q`
+- `pytest tests/adapter/matrix/test_dispatcher.py tests/adapter/matrix/test_confirm.py -q`
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+1. `[Rule 2 - Critical functionality]` Sanitized save names before using them in save/load prompts.
+   This rejects names outside `[A-Za-z0-9_-]` and prevents path-like input from flowing into `/workspace/contexts/{name}.md`.
+
+2. `[Rule 2 - Critical functionality]` Cleared the active current-session marker on reset.
+   Without this, `!context` could report a stale loaded session after `!reset`.
+
+## Files Changed
+
+- `sdk/prototype_state.py`
+- `adapter/matrix/store.py`
+- `adapter/matrix/handlers/__init__.py`
+- `adapter/matrix/handlers/context_commands.py`
+- `adapter/matrix/bot.py`
+- `sdk/real.py`
+- `tests/adapter/matrix/test_context_commands.py`
+- `tests/platform/test_prototype_state.py`
+
+## Self-Check: PASSED