docs(09-02): complete LimiterRegistry plan

.planning/REQUIREMENTS.md

@@ -204,7 +204,7 @@ Requirements for initial release. Each maps to roadmap phases.
 
 ### OSINT/Recon — Infrastructure
 
-- [ ] **RECON-INFRA-05**: Per-source rate limiter with configurable limits
+- [x] **RECON-INFRA-05**: Per-source rate limiter with configurable limits
 - [ ] **RECON-INFRA-06**: Stealth mode (--stealth) with UA rotation and increased delays
 - [ ] **RECON-INFRA-07**: robots.txt respect (--respect-robots, default on)
 - [ ] **RECON-INFRA-08**: Recon full command — parallel sweep across all sources with deduplication

.planning/phases/09-osint-infrastructure/09-02-SUMMARY.md

@@ -0,0 +1,97 @@
+---
+phase: 09-osint-infrastructure
+plan: 02
+subsystem: recon
+tags: [recon, rate-limiting, stealth, infrastructure]
+requires:
+  - golang.org/x/time/rate
+provides:
+  - pkg/recon.LimiterRegistry
+  - pkg/recon.NewLimiterRegistry
+  - LimiterRegistry.For
+  - LimiterRegistry.Wait
+affects: []
+tech-stack:
+  added: []
+  patterns:
+    - per-source rate.Limiter map guarded by sync.Mutex
+    - idempotent registry lookup (first registration wins)
+    - optional stealth jitter (100ms-1s) gated by flag
+key-files:
+  created:
+    - pkg/recon/limiter.go
+    - pkg/recon/limiter_test.go
+  modified: []
+decisions:
+  - Jitter range fixed at 100ms + rand[0,900)ms per plan spec (max ~1000ms)
+  - First For() call wins; later rate/burst arguments are ignored to preserve token state
+  - Added TestJitterDisabled as extra guard (Rule 2: correctness)
+metrics:
+  completed: 2026-04-05
+  duration: ~5 min
+  tasks: 1/1
+requirements: [RECON-INFRA-05]
+---
+
+# Phase 09 Plan 02: LimiterRegistry Summary
+
+Per-source rate limiting foundation using `golang.org/x/time/rate` with optional stealth jitter, keyed by source name via a mutex-guarded registry.
+
+## What Was Built
+
+- **`pkg/recon/limiter.go`** — `LimiterRegistry` type with:
+  - `NewLimiterRegistry()` constructor (empty map)
+  - `For(name, r, burst) *rate.Limiter` — idempotent lookup; creates on first call, returns the same pointer on subsequent calls
+  - `Wait(ctx, name, r, burst, stealth) error` — acquires limiter (via `For`), blocks on `limiter.Wait(ctx)`, then sleeps a random 100ms–1000ms jitter if `stealth==true`, respecting ctx cancellation during the sleep
+- **`pkg/recon/limiter_test.go`** — 5 tests:
+  - `TestLimiterPerSourceIsolation` — different names → distinct `*rate.Limiter`
+  - `TestLimiterIdempotent` — same name → same pointer
+  - `TestWaitRespectsContext` — pre-cancelled ctx returns error
+  - `TestJitterRange` — stealth=true elapsed ∈ [90ms, 1200ms]
+  - `TestJitterDisabled` — stealth=false elapsed < 50ms
+
+## Satisfies
+
+- **RECON-INFRA-05** — "each source owns its own limiter — no centralization". Verified via `TestLimiterPerSourceIsolation`.
+- Partial foundation for **RECON-INFRA-06** (stealth jitter) — fully wired into the engine in plan 09-03.
+
+## Verification
+
+```
+go test -run 'TestLimiter|TestWait|TestJitter' -count=1 -v \
+  ./pkg/recon/limiter.go ./pkg/recon/limiter_test.go ./pkg/recon/source.go
+```
+
+Result: 5/5 PASS.
+
+Tests were executed via explicit file list because sibling plans in the same wave (09-03, 09-04) have landed test files (`engine_test.go`, `robots_test.go`) whose implementation files are still in flight. This is expected parallel-wave behavior and does not affect the correctness of this plan's code. Once all wave-1 plans merge, `go test ./pkg/recon/...` will run the full suite.
+
+`go vet ./pkg/recon/limiter.go ./pkg/recon/source.go` is clean.
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 2 — Missing coverage] Added `TestJitterDisabled`**
+- **Found during:** Task 1
+- **Issue:** Plan tested jitter upper/lower bounds with stealth on, but did not assert the negative case — a regression that applied jitter even when stealth=false would go undetected.
+- **Fix:** Added `TestJitterDisabled` asserting elapsed < 50ms when stealth=false.
+- **Files modified:** `pkg/recon/limiter_test.go`
+- **Commit:** 590fc33
+
+No architectural deviations. No blockers.
+
+## Commits
+
+- `590fc33` — feat(09-02): add LimiterRegistry with per-source rate limiters and jitter
+
+## Self-Check: PASSED
+
+- FOUND: pkg/recon/limiter.go
+- FOUND: pkg/recon/limiter_test.go
+- FOUND commit: 590fc33
+- All plan tasks (1/1) complete
+- All plan success criteria met:
+  - LimiterRegistry exported with `For` and `Wait` ✓
+  - Each source receives its own `*rate.Limiter` ✓
+  - Stealth jitter range 100ms–1s enforced ✓