notes(bf-32n): document that bounds enforcement tests already exist

All acceptance criteria verified - TestAdaptiveRateLimiter_BasicBounds
already exists and passes with injected window duration.

Co-Authored-By: Claude <noreply@anthropic.com>

notes/bf-32n.md

@@ -0,0 +1,29 @@
+# Bead bf-32n: Add bounds enforcement tests
+
+## Status
+
+**Already complete** - The required test `TestAdaptiveRateLimiter_BasicBounds` already exists and passes all acceptance criteria.
+
+## Verification
+
+All acceptance criteria met:
+
+1. ✅ TestAdaptiveRateLimiter_BasicBounds test function exists (line 982)
+2. ✅ Table-driven with multiple bound scenarios (4 test cases)
+3. ✅ Tests use injected window duration (testWindow = 10ms, no sleep calls)
+4. ✅ Tests verify rate stays in [minRate, maxRate] under all conditions
+5. ✅ Tests pass: `go test ./proxy -v -run TestAdaptiveRateLimiter_BasicBounds`
+
+## Scope Coverage
+
+All required scenarios covered:
+- ✅ Rate never drops below minRate (default: 10)
+- ✅ Rate never exceeds maxRate (default: 100)
+- ✅ Heavy 429 load drives rate to min but not below
+- ✅ Continuous success drives rate to max but not above
+
+## Original Implementation
+
+Test was added in commit 88358f9 ("test(ratelimiter): add basic state and bounds tests for AdaptiveRateLimiter") and improved in commit 22644ea to use injected window duration for faster test execution.
+
+Location: `proxy/ratelimiter_test.go:982-1066`