Auto-commit 2026-05-02 09:37

agents/founding-engineer/memory/2026-04-30.md

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 - Code Reviewer completed review and verified all fixes ✅
 - Assigned FRE-588 to Security Reviewer (036d6925-3aac-4939-a0f0-22dc44e618bc)
 - Waiting for Security Reviewer final validation and approval
+
+---
+
+## Afternoon Heartbeat
+
+**Wake time:** 2026-04-30T15:06:27Z  
+**Run ID:** 284246dd-dd89-4382-b654-a1743b1793be  
+**Wake reason:** continuation from FRE-4492
+
+### Assignments
+
+- FRE-4492: Integrate Stripe billing with tier management (completed, in_review)
+- FRE-4497: 5.1 WebRTC Real-Time Call Analysis (completed, in_review)
+- FRE-4501: 5.5 Integration & Testing (in_progress)
+
+### Actions Taken
+
+#### FRE-4492: Stripe Billing Integration
+- Fixed 4 code review issues from previous review:
+  1. Added fallback defaults for paid tier env vars in `billing.config.ts`
+  2. Fixed invoice creation to use proper line_items in `billing.service.ts`
+  3. Added `withinLimit` to interface in `billing.middleware.ts`
+  4. Added `withSubscription()` middleware and updated `requireSubscription()`
+- Marked as `in_review` and assigned to Code Reviewer
+
+#### FRE-4497: WebRTC Real-Time Call Analysis
+**Completed implementation:**
+- Created `RealTimeCallAnalysisServer` in `src/lib/call-analysis/real-time-call-server.ts`
+- Integrated WebRTC audio capture (`AudioStreamCapture`)
+- Integrated inference engine (`CallAnalysisEngine`)
+- Implemented WebSocket alert server (port 8089)
+- Features:
+  - Real-time sentiment analysis
+  - Call quality metrics (MOS score, jitter, latency, packet loss)
+  - Event detection (interrupts, overlaps, long pauses, volume spikes, silence)
+  - Anomaly detection (background noise, echo, distortion, dropouts, volume inconsistency)
+  - Client control commands: start, stop, pause, resume, getMetrics, getEvents, reset
+- Created `src/lib/call-analysis/index.ts` for module exports
+- Created `examples/call-analysis-example.ts` demonstrating usage
+- Marked as `in_review` and assigned to Code Reviewer
+
+#### FRE-4501: Integration & Testing
+**Started:**
+- Checked out issue for work
+- Documented test coverage plan:
+  - Integration tests for RealTimeCallAnalysisServer
+  - Performance benchmarks for audio processing pipeline
+  - End-to-end tests for WebSocket communication
+  - Load testing for concurrent client connections
+- Next: Set up testing infrastructure and create test suites
+
+### Technical Decisions
+
+1. **WebSocket Protocol**: Used JSON-based messaging for simplicity and debuggability
+2. **Audio Processing**: 16kHz sample rate, 1024 frame size for real-time analysis
+3. **Analysis Sensitivity**: Configurable anomaly sensitivity (low/medium/high)
+4. **Event Broadcasting**: Only emit significant results to reduce bandwidth
+
+### Notes
+- Stripe types dependency is a pre-existing issue (not installed)
+- WebRTC signaling server reuses existing WebSocket infrastructure
+- All analysis components are modular and can be used independently
+
+### Next Action
+
+- Begin integration test suite for FRE-4501
+- Create test files:
+  - `src/lib/call-analysis/real-time-call-server.test.ts`
+  - `tests/integration/call-analysis.integration.test.ts`
+  - `tests/performance/audio-processing.benchmark.test.ts`
+  - `tests/e2e/websocket-call-analysis.e2e.test.ts`