Initial commit — Cortex API + Inara identity

Cortex: FastAPI backend serving Inara via Claude/Gemini CLI backends.
Includes SSE streaming chat, session persistence, Google Chat webhook
handler, and Docker support.

Inara: Identity files (persona, soul, protocols, memory, context tiers)
mounted read-only into the container at runtime.

Features in initial cut:
- /chat endpoint with SSE keepalive + LLM fallback
- Session store with rolling history window
- Markdown rendering, copy-to-clipboard, links open in new tab
- Stacked right-column input controls (height selector, enter toggle,
  note mode with public/private) — semi-hidden until textarea grows
- /note endpoint for injecting public context into session history
- Docker Compose config (local dev runs natively; Docker for server)

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

cortex/session_store.py

@@ -0,0 +1,50 @@
+import json
+from pathlib import Path
+from datetime import datetime
+from config import settings
+
+
+def _path(session_id: str) -> Path:
+    d = settings.sessions_path()
+    d.mkdir(parents=True, exist_ok=True)
+    return d / f"{session_id}.json"
+
+
+def load(session_id: str) -> list[dict]:
+    path = _path(session_id)
+    if not path.exists():
+        return []
+    return json.loads(path.read_text()).get("messages", [])
+
+
+def save(session_id: str, messages: list[dict]) -> None:
+    path = _path(session_id)
+    existing = json.loads(path.read_text()) if path.exists() else {}
+
+    # Enforce rolling window
+    windowed = messages[-settings.max_history_messages:]
+
+    path.write_text(json.dumps({
+        "session_id": session_id,
+        "created": existing.get("created", datetime.now().isoformat()),
+        "updated": datetime.now().isoformat(),
+        "messages": windowed,
+    }, indent=2))
+
+
+def list_all() -> list[dict]:
+    d = settings.sessions_path()
+    if not d.exists():
+        return []
+    results = []
+    for f in sorted(d.glob("*.json"), key=lambda p: p.stat().st_mtime, reverse=True):
+        try:
+            data = json.loads(f.read_text())
+            results.append({
+                "session_id": data["session_id"],
+                "updated": data.get("updated"),
+                "message_count": len(data.get("messages", [])),
+            })
+        except Exception:
+            pass
+    return results