docs: update DEVELOPMENT_LOG for v0.20.5 pipeline completion

DEVELOPMENT_LOG.md

@@ -14,8 +14,8 @@
 | Agent | Status | Time | Notes |
 |-------|--------|------|-------|
 | Neo | ✅ COMPLETED | 2m6s | Added max 50 items, duplicate detection, input validation |
-| Bishop | ⏳ PENDING | — | Verification |
+| Bishop | ✅ COMPLETED | 6m44s | 13/13 PASS (all endpoint tests verified) |
-| Hudson | ⏳ PENDING | — | Security audit |
+| Hudson | ✅ COMPLETED (2 FAIL → fixed) | 29s | Type coercion + Infinity bypass found, both fixed by Ripley |
 
 **Files modified:** `routes/payments.js`, `client/lib/version.js`, `package.json`
 
@@ -31,7 +31,19 @@ Add input validation on /api/payments/bulk endpoint.
 - [x] Comment block with validation rules
 - [x] Version bumped to 0.20.5
 
-**Security Audit (Hudson):** Pending
+**Security Audit (Hudson):**
+1. Max items bypass: ✅ PASS
+2. Type coercion attack (bill_id): ❌ FAIL → Fixed (regex `/^\d+$/` check added)
+3. Date regex bypass: ⚠️ MEDIUM (not critical, format-only check)
+4. Amount validation (Infinity): ❌ FAIL → Fixed (`!isFinite()` check added)
+5. SQL injection: ✅ PASS
+6. Authorization bypass: ✅ PASS
+7. Breaking change: ✅ PASS
+
+**Fixes applied by Ripley:**
+- `bill_id`: Added `/^\d+$/` regex check before parseInt to prevent `"1abc"` → `1` coercion
+- `amount`: Added `!isFinite(parsedAmt)` check to reject `Infinity` values
+- Also fixed `skipped.push()` to use `parsedAmt` instead of raw `amount`
 
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