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/context_loader.py

@@ -0,0 +1,52 @@
+from pathlib import Path
+from config import settings
+
+
+# Files loaded per tier — mirrors CONTEXT_TIERS.md
+TIER_FILES: dict[int, list[str]] = {
+    1: ["SOUL.md", "IDENTITY.md"],          # + USER.md summary only
+    2: ["SOUL.md", "IDENTITY.md", "USER.md", "MEMORY.md", "PROTOCOLS.md"],
+    3: ["SOUL.md", "IDENTITY.md", "USER.md", "MEMORY.md", "PROTOCOLS.md"],
+    4: ["SOUL.md", "IDENTITY.md", "USER.md", "MEMORY.md", "PROTOCOLS.md"],
+}
+
+# Lines of USER.md to include at Tier 1 (just identity + what he cares about)
+TIER_1_USER_LINES = 30
+
+
+def _read(path: Path) -> str:
+    if path.exists():
+        return path.read_text()
+    return f"[missing: {path.name}]"
+
+
+def load_context(tier: int = 2) -> str:
+    inara_dir = settings.inara_path()
+    parts = []
+
+    files = TIER_FILES.get(tier, TIER_FILES[2])
+
+    for filename in files:
+        path = inara_dir / filename
+        if not path.exists():
+            continue
+
+        if filename == "USER.md" and tier == 1:
+            # Tier 1: include only the first N lines
+            lines = path.read_text().splitlines()[:TIER_1_USER_LINES]
+            content = "\n".join(lines)
+        else:
+            content = path.read_text()
+
+        parts.append(f"--- {filename} ---\n{content}")
+
+    if tier >= 3:
+        # Add recent session logs
+        sessions_dir = inara_dir / "sessions"
+        if sessions_dir.exists():
+            count = 2 if tier == 3 else 7
+            session_files = sorted(sessions_dir.glob("*.md"), reverse=True)[:count]
+            for sf in session_files:
+                parts.append(f"--- Session: {sf.name} ---\n{sf.read_text()}")
+
+    return "\n\n".join(parts)