feat: Lyra's journal — permanent thought record + a knowing journal note

Her reflections/metacognition were capped rolling windows (6/5), so older
thoughts were lost for good. Now everything she produces is also appended to a
permanent, append-only journal; the capped lists stay as her working-memory
window for context.

- memory: journal table + add_journal_entry/list_journal
- reflect(): persists every committed reflection + critique to the journal, and
  the examine step gains a "journal" field — a deliberate, first-person note she
  writes for herself (her knowing journaling), tagged by source (dream/manual)
- web: /journal diary view (kind filters, grouped by day) + /journal/data;
  linked from /self
- tests assert reflections + metacognition land in the journal

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lyra/web/server.py

@@ -132,6 +132,15 @@ def create_app() -> FastAPI:
         state = await asyncio.to_thread(self_state.reflect)
         return {"ok": True, "mood": state.get("mood")}
 
+    @app.get("/journal")
+    async def journal_page() -> FileResponse:
+        """Lyra's journal — the permanent, append-only record of her thoughts."""
+        return FileResponse(str(_STATIC / "journal.html"))
+
+    @app.get("/journal/data")
+    async def journal_data(limit: int = 300) -> dict:
+        return {"entries": memory.list_journal(limit=limit)}
+
     @app.get("/stream/logs")
     async def stream_logs(request: Request) -> StreamingResponse:
         """Live activity feed: replay the recent buffer, then stream new events."""