Add session log for 2026-02-19

Full record of everything done in today's session: plugin creation,
compile fixes, documentation (Markdown + PowerPoint), git history,
technical decisions made, and next steps.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/session_log_2026-02-19.md

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+# Session Log — 2026-02-19
+
+**Project**: PS_AI_Agent (Unreal Engine 5.5)
+**Machine**: Desktop PC (j_foucher)
+**Working directory**: `E:\ASTERION\GIT\PS_AI_Agent`
+
+---
+
+## Conversation Summary
+
+### 1. Initial Request
+User asked to create a plugin to use the ElevenLabs Conversational AI Agent in UE5.5.
+Reference: existing Convai plugin (gRPC-based, more complex). Goal: simpler version using ElevenLabs.
+Plugin name requested: `PS_AI_Agent_ElevenLabs`.
+
+### 2. Codebase Exploration
+Explored the Convai plugin source at `ConvAI/Convai/` to understand:
+- Module/settings structure
+- AudioCapture patterns
+- HTTP proxy pattern
+- gRPC streaming architecture (to know what to replace with WebSocket)
+- Convai already had `EVoiceType::ElevenLabsVoices` — confirming the direction
+
+### 3. Plugin Created
+All source files written from scratch under:
+`Unreal/PS_AI_Agent/Plugins/PS_AI_Agent_ElevenLabs/`
+
+Files created:
+- `PS_AI_Agent_ElevenLabs.uplugin`
+- `PS_AI_Agent_ElevenLabs.Build.cs`
+- `Public/PS_AI_Agent_ElevenLabs.h` — Module + `UElevenLabsSettings`
+- `Public/ElevenLabsDefinitions.h` — Enums, structs, protocol constants
+- `Public/ElevenLabsWebSocketProxy.h` + `.cpp` — WS session manager
+- `Public/ElevenLabsConversationalAgentComponent.h` + `.cpp` — Main NPC component
+- `Public/ElevenLabsMicrophoneCaptureComponent.h` + `.cpp` — Mic capture
+- `PS_AI_Agent.uproject` — Plugin registered
+
+Commit: `f0055e8`
+
+### 4. Memory Files Created
+To allow context recovery on any machine (including laptop):
+- `.claude/MEMORY.md` — project structure + patterns (auto-loaded by Claude Code)
+- `.claude/elevenlabs_plugin.md` — plugin file map + API protocol details
+- `.claude/project_context.md` — original ask, intent, short/long-term goals
+- Local copy also at `C:\Users\j_foucher\.claude\projects\...\memory\`
+
+Commit: `f0055e8` (with plugin), updated in `4d6ae10`
+
+### 5. .gitignore Updated
+Added to existing ignores:
+- `Unreal/PS_AI_Agent/Plugins/*/Binaries/`
+- `Unreal/PS_AI_Agent/Plugins/*/Intermediate/`
+- `Unreal/PS_AI_Agent/*.sln` / `*.suo`
+- `.claude/settings.local.json`
+- `generate_pptx.py`
+
+Commit: `4d6ae10`, `b114ab0`
+
+### 6. Compile — First Attempt (Errors Found)
+Ran `Build.bat PS_AI_AgentEditor Win64 Development`. Errors:
+- `WebSockets` listed in `.uplugin` — it's a module not a plugin → removed
+- `OpenDefaultCaptureStream` doesn't exist in UE 5.5 → use `OpenAudioCaptureStream`
+- `FOnAudioCaptureFunction` callback uses `const void*` not `const float*` → fixed cast
+- `TArray::RemoveAt(0, N, false)` deprecated → use `EAllowShrinking::No`
+- `AudioCapture` is a plugin and must be in `.uplugin` Plugins array → added
+
+Commit: `bb1a857`
+
+### 7. Compile — Success
+Clean build, no warnings, no errors.
+Output: `Plugins/PS_AI_Agent_ElevenLabs/Binaries/Win64/UnrealEditor-PS_AI_Agent_ElevenLabs.dll`
+
+Memory updated with confirmed UE 5.5 API patterns. Commit: `3b98edc`
+
+### 8. Documentation — Markdown
+Full reference doc written to `.claude/PS_AI_Agent_ElevenLabs_Documentation.md`:
+- Installation, Project Settings, Quick Start (BP + C++), Components Reference,
+  Data Types, Turn Modes, Security/Signed URL, Audio Pipeline, Common Patterns, Troubleshooting.
+
+Commit: `c833ccd`
+
+### 9. Documentation — PowerPoint
+20-slide dark-themed PowerPoint generated via Python (python-pptx 1.0.2):
+- File: `PS_AI_Agent_ElevenLabs_Documentation.pptx` in repo root
+- Covers all sections with visual layout, code blocks, flow diagrams, colour-coded elements
+- Generator script `generate_pptx.py` excluded from git via .gitignore
+
+Commit: `1b72026`
+
+---
+
+## Git History (this session)
+
+| Hash | Message |
+|------|---------|
+| `f0055e8` | Add PS_AI_Agent_ElevenLabs plugin (initial implementation) |
+| `4d6ae10` | Update .gitignore: exclude plugin build artifacts and local Claude settings |
+| `b114ab0` | Broaden .gitignore: use glob for all plugin Binaries/Intermediate |
+| `bb1a857` | Fix compile errors in PS_AI_Agent_ElevenLabs plugin |
+| `3b98edc` | Update memory: document confirmed UE 5.5 API patterns and plugin compile status |
+| `c833ccd` | Add plugin documentation for PS_AI_Agent_ElevenLabs |
+| `1b72026` | Add PowerPoint documentation and update .gitignore |
+
+---
+
+## Key Technical Decisions Made This Session
+
+| Decision | Reason |
+|----------|--------|
+| WebSocket instead of gRPC | ElevenLabs Conversational AI uses WS/JSON; no ThirdParty libs needed |
+| `AudioCapture` in `.uplugin` Plugins array | It's an engine plugin, not a module — UBT requires it declared |
+| `WebSockets` in Build.cs only | It's a module (no `.uplugin` file), declaring it in `.uplugin` causes build error |
+| `FOnAudioCaptureFunction` uses `const void*` | UE 5.3+ API change — must cast to `float*` inside callback |
+| `EAllowShrinking::No` | Bool overload of `RemoveAt` deprecated in UE 5.5 |
+| `USoundWaveProcedural` for playback | Allows pushing raw PCM bytes at runtime without file I/O |
+| Silence threshold = 30 ticks | ~0.5s at 60fps heuristic to detect agent finished speaking |
+
+---
+
+## Next Steps (not done yet)
+
+- [ ] Open in UE 5.5 Editor and test with a real ElevenLabs agent
+- [ ] Verify mic audio actually reaches ElevenLabs (enable Verbose Logging)
+- [ ] Test `USoundWaveProcedural` underflow behaviour in practice
+- [ ] Add lip-sync support (future)
+- [ ] Add session memory / conversation history (future, matching Convai)
+- [ ] Add environment/action context support (future)
+- [ ] Consider Signed URL Mode backend implementation