Add state-hub v0.1 — local-first state service for the Custodian

Implements the first live layer of the Custodian cognitive infrastructure:
PostgreSQL schema, FastAPI REST API, FastMCP stdio server, and Observable
Framework telemetry dashboard.

- state-hub/: full stack (docker-compose, FastAPI, Alembic, MCP server, dashboard)
- 5 DB tables: topics, workstreams, tasks, decisions, progress_events
- 11 MCP tools + 5 resources registered in .mcp.json
- Observable dashboard: Overview, Workstreams, Decisions, Progress pages
- CLAUDE.md: session protocol (get_state_summary / add_progress_event ritual)
- ~/.claude/CLAUDE.md: global cross-project reference to the hub
- scripts/pull_image.py: WSL2 TLS-resilient Docker image downloader

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

api/main.py

@@ -0,0 +1,32 @@
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+
+from api.database import engine
+from api.routers import decisions, progress, state, tasks, topics, workstreams
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    yield
+    await engine.dispose()
+
+
+app = FastAPI(
+    title="Custodian State Hub",
+    description="Local-first state API for the Custodian agent system.",
+    version="0.1.0",
+    lifespan=lifespan,
+)
+
+app.include_router(topics.router)
+app.include_router(workstreams.router)
+app.include_router(tasks.router)
+app.include_router(decisions.router)
+app.include_router(progress.router)
+app.include_router(state.router)
+
+
+@app.get("/", include_in_schema=False)
+async def root():
+    return {"service": "state-hub", "docs": "/docs"}