feat(goals): add domain/repo goal tracking and update_workstream MCP tool

- Migration c5d6e7f8a9b0: domain_goals and repo_goals tables, repo_goal_id FK on workstreams
- DomainGoal: one active per domain (partial unique index), status active/archived/superseded
- RepoGoal: integer priority, status active/paused/completed/archived, optional domain_goal_id link
- WorkstreamUpdate schema and router extended with repo_goal_id and repo_goal_id filter
- 6 new MCP goal tools: create_domain_goal, get_domain_goals, activate_domain_goal, create_repo_goal, get_repo_goals, update_repo_goal
- update_workstream MCP tool: patch any subset of workstream fields (title, description, owner, due_date, repo_goal_id, status)
- get_domain_summary extended with goal_guidance (needs_workplan, alignment_warnings) signals
- Dashboard goals.md page and docs/goals.md reference page
- CLAUDE.md template updated to act on goal_guidance signals at session start
- CUST-WP-0010 workplan for this feature

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

api/main.py

@@ -5,7 +5,7 @@ from fastapi.middleware.cors import CORSMiddleware
 
 from api.database import engine
 from api.routers import decisions, extension_points, progress, state, tasks, technical_debt, topics, workstreams, workstream_dependencies
-from api.routers import domains, repos, contributions, sbom, policy
+from api.routers import domains, repos, contributions, sbom, policy, domain_goals, repo_goals
 
 
 @asynccontextmanager
@@ -38,6 +38,8 @@ app.include_router(decisions.router)
 app.include_router(extension_points.router)
 app.include_router(technical_debt.router)
 app.include_router(progress.router)
+app.include_router(domain_goals.router)
+app.include_router(repo_goals.router)
 app.include_router(contributions.router)
 app.include_router(sbom.router)
 app.include_router(state.router)