Initial project structure

Scaffold all modules, route stubs, data models, and config.
No logic implemented yet — all core methods raise NotImplementedError.
Establishes the full directory layout matching the architecture in CLAUDE.md.

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

main.py

@@ -0,0 +1,35 @@
+"""
+Fellowship — entry point.
+Run with: uvicorn main:app --reload
+"""
+
+import logging
+
+from fastapi import FastAPI
+
+from fellowship.api.routes import sessions
+from fellowship.config import settings
+from fellowship.logger import setup_logging
+
+setup_logging()
+logger = logging.getLogger(__name__)
+
+app = FastAPI(
+    title="Fellowship",
+    description="Multi-bot LLM session orchestration API.",
+    version="0.1.0",
+    docs_url="/docs",
+    openapi_url="/openapi.json",
+)
+
+app.include_router(sessions.router, prefix="/v1")
+
+
+@app.on_event("startup")
+async def startup() -> None:
+    logger.info("Fellowship starting up")
+
+
+@app.on_event("shutdown")
+async def shutdown() -> None:
+    logger.info("Fellowship shutting down")