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/models/__init__.py

@@ -0,0 +1,15 @@
+from api.models.base import Base
+from api.models.topic import Topic, TopicStatus, Domain
+from api.models.workstream import Workstream, WorkstreamStatus
+from api.models.task import Task, TaskStatus, TaskPriority
+from api.models.decision import Decision, DecisionType, DecisionStatus
+from api.models.progress_event import ProgressEvent
+
+__all__ = [
+    "Base",
+    "Topic", "TopicStatus", "Domain",
+    "Workstream", "WorkstreamStatus",
+    "Task", "TaskStatus", "TaskPriority",
+    "Decision", "DecisionType", "DecisionStatus",
+    "ProgressEvent",
+]