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- DomainGoal: one active per domain (partial unique index), status active/archived/superseded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/models/__init__.py

@@ -1,6 +1,9 @@
 from api.models.base import Base
 from api.models.domain import Domain
+from api.models.domain_goal import DomainGoal, DomainGoalStatus
 from api.models.topic import Topic, TopicStatus
+from api.models.managed_repo import ManagedRepo
+from api.models.repo_goal import RepoGoal, RepoGoalStatus
 from api.models.workstream import Workstream, WorkstreamStatus
 from api.models.workstream_dependency import WorkstreamDependency
 from api.models.task import Task, TaskStatus, TaskPriority
@@ -8,7 +11,6 @@ from api.models.decision import Decision, DecisionType, DecisionStatus
 from api.models.progress_event import ProgressEvent
 from api.models.extension_point import ExtensionPoint, EPStatus
 from api.models.technical_debt import TechnicalDebt, TDStatus
-from api.models.managed_repo import ManagedRepo
 from api.models.contribution import Contribution, ContributionType, ContributionStatus
 from api.models.sbom_snapshot import SBOMSnapshot
 from api.models.sbom_entry import SBOMEntry, Ecosystem
@@ -16,7 +18,10 @@ from api.models.sbom_entry import SBOMEntry, Ecosystem
 __all__ = [
     "Base",
     "Domain",
+    "DomainGoal", "DomainGoalStatus",
     "Topic", "TopicStatus",
+    "ManagedRepo",
+    "RepoGoal", "RepoGoalStatus",
     "Workstream", "WorkstreamStatus",
     "WorkstreamDependency",
     "Task", "TaskStatus", "TaskPriority",
@@ -24,7 +29,6 @@ __all__ = [
     "ProgressEvent",
     "ExtensionPoint", "EPStatus",
     "TechnicalDebt", "TDStatus",
-    "ManagedRepo",
     "Contribution", "ContributionType", "ContributionStatus",
     "SBOMSnapshot",
     "SBOMEntry", "Ecosystem",