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/config.py

@@ -0,0 +1,41 @@
+from pathlib import Path
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    anthropic_api_key: str | None = None  # not used — claude CLI handles auth
+    inara_dir: Path = Path("../inara")
+    sessions_dir: Path = Path("./data/sessions")
+    default_model: str = "claude-sonnet-4-6"
+    default_tier: int = 2
+    max_history_messages: int = 40  # rolling window — 20 turns (user + assistant)
+    primary_backend: str = "claude"  # "claude" or "gemini" — other is always fallback
+
+    # Per-backend timeouts in seconds
+    timeout_claude: int = 60
+    timeout_gemini: int = 120   # frequently slow under load
+    timeout_local: int = 300    # local models may need to load first
+
+    # Google Chat must receive a response within 30s or shows an error to the user
+    google_chat_timeout: int = 25
+    # Backend forced for Google Chat — Claude is more reliable within the 25s deadline
+    google_chat_backend: str = "claude"
+    host: str = "0.0.0.0"
+    port: int = 8000
+
+    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")
+
+    def inara_path(self) -> Path:
+        """Resolve inara_dir relative to this file's location if not absolute."""
+        if self.inara_dir.is_absolute():
+            return self.inara_dir
+        return (Path(__file__).parent / self.inara_dir).resolve()
+
+    def sessions_path(self) -> Path:
+        """Resolve sessions_dir relative to this file's location if not absolute."""
+        if self.sessions_dir.is_absolute():
+            return self.sessions_dir
+        return (Path(__file__).parent / self.sessions_dir).resolve()
+
+
+settings = Settings()