docs(16-write-guardrails-01): complete plan

Author: keithah

.planning/STATE.md

@@ -14,21 +14,21 @@ See: .planning/PROJECT.md (updated 2026-02-09)
 **Total Phases:** 16
 **Current Plan:** 1
 **Total Plans in Phase:** 1
-**Status:** Ready to execute
-**Progress:** [          ] 0%
+**Status:** Complete
+**Progress:** [██████████] 100%
 
 **Last Activity:** 2026-02-10
-**Last Activity Description:** Started Phase 16: write-mode guardrails (path policy, secret scan, rate limiting)
+**Last Activity Description:** Phase 16 plan 01 complete; write-mode guardrails (path policy, secret scan, rate limiting)
 **Paused At:** None
 
 Milestone: v0.2 (planning)
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 31
+- Total plans completed: 32
 - Average duration: 3min
-- Total execution time: 139min
+- Total execution time: 164min
 
 **By Phase:**
 
@@ -60,6 +60,7 @@ Milestone: v0.2 (planning)
 | Phase 13-xbmc-cutover P03 | 8 min | 1 tasks | 1 files |
 | Phase 14-write-mode-foundations P01 | 15 min | 3 tasks | 4 files |
 | Phase 15-write-pipeline P01 | 20 min | 3 tasks | 6 files |
+| Phase 16-write-guardrails P01 | 25 min | 3 tasks | 6 files |
 
 ## Deployment Info
 

.planning/phases/16-write-guardrails/16-01-SUMMARY.md

@@ -0,0 +1,53 @@
+---
+phase: 16-write-guardrails
+plan: 01
+subsystem: write-mode
+tags: [write-mode, guardrails, secrets, policy, rate-limit]
+
+# Dependency graph
+requires:
+  - phase: 15-write-pipeline
+    provides: Mention-driven PR pipeline
+provides:
+  - Configurable write policy (allow/deny paths, secret scan, rate limit)
+  - Enforcement before commit/push with clear user refusals
+affects: [mentions, workspace, config, ops]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Enforce guardrails in trusted code before commit/push"
+    - "Deny wins over allow; allowPaths optional"
+    - "Best-effort secret scan against staged diff"
+    - "In-memory write request rate limiter keyed by installation+repo"
+
+key-files:
+  created: []
+  modified:
+    - src/execution/config.ts
+    - src/jobs/workspace.ts
+    - src/handlers/mention.ts
+    - docs/runbooks/mentions.md
+
+key-decisions:
+  - "Keep path pattern matching simple and deterministic (dir/, *.ext, exact)"
+  - "Refuse policy violations with a concise reply (not a generic error)"
+
+# Metrics
+duration: 25 min
+completed: 2026-02-10
+---
+
+# Phase 16 Plan 01: Write Guardrails Summary
+
+**Added safety guardrails for mention-driven writes: path allow/deny policy, secret scan blocks, and basic rate limiting.**
+
+## Verification
+
+- `bun test`
+
+## Task Commits
+
+1. `c25ca1d4d2` feat(config): add write policy settings (paths, secrets, rate)
+2. `f760981d91` feat(write): enforce path policy, secret scan, and rate limiting