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- DomainGoal: one active per domain (partial unique index), status active/archived/superseded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>

dashboard/observablehq.config.js

@@ -8,6 +8,7 @@ export default {
     // ── Organizational Entity Views ───────────────────────────────────────────
     { name: "Domains", path: "/domains" },
     { name: "Repos",   path: "/repos" },
+    { name: "Goals",   path: "/goals" },
     {
       name: "Workstreams",
       path: "/workstreams",
@@ -47,6 +48,7 @@ export default {
         { name: "Decisions",               path: "/docs/decisions" },
         { name: "Dependencies",             path: "/docs/dependencies" },
         { name: "Domains",                  path: "/docs/domains" },
+        { name: "Goals",                    path: "/docs/goals" },
         { name: "Extension Points",         path: "/docs/extensions" },
         { name: "Inter-Repo Communication", path: "/docs/inter-repo-communication" },
         { name: "Interventions",            path: "/docs/interventions" },