feat(tasks): add needs_human intervention flag (CUST-WP-0009)

- Migration b4c5d6e7f8a9: adds needs_human (bool) + intervention_note (text) to tasks
- API: needs_human filter on GET /tasks/; 422 if flagged without note
- 3 MCP tools: flag_for_human, clear_human_flag, list_human_interventions
- Dashboard: interventions.md with amber cards and "Mark done" button
- Policy router + workstream DoD policy (workstream-dod.md)
- Workstream lifecycle docs page + workplan CUST-WP-0010
- CLAUDE.md: add step 4 (run fix-consistency after workplan writes)
- consistency_check.py: promote C-11 unlinked tasks from INFO to WARN

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

dashboard/observablehq.config.js

@@ -3,8 +3,9 @@ export default {
   title: "Custodian State Hub",
   pages: [
     // ── Overview ──────────────────────────────────────────────────────────────
-    { name: "Overview", path: "/" },
-    { name: "Todo",     path: "/todo" },
+    { name: "Overview",       path: "/" },
+    { name: "Todo",           path: "/todo" },
+    { name: "Interventions",  path: "/interventions" },
     // ── Organizational Entity Views ───────────────────────────────────────────
     { name: "Domains", path: "/domains" },
     { name: "Repos",   path: "/repos" },
@@ -25,6 +26,15 @@ export default {
     { name: "Contributions", path: "/contributions" },
     { name: "SBOM",          path: "/sbom" },
     { name: "Progress",      path: "/progress" },
+    // ── Policy ────────────────────────────────────────────────────────────────
+    {
+      name: "Policy",
+      collapsible: true,
+      open: true,
+      pages: [
+        { name: "Workstream DoD", path: "/policy/workstream-dod" },
+      ],
+    },
     // ── Reference ─────────────────────────────────────────────────────────────
     {
       name: "Reference",
@@ -50,6 +60,7 @@ export default {
         { name: "Technical Debt",           path: "/docs/debt" },
         { name: "Todo",                     path: "/docs/todo" },
         { name: "Workstream Health",        path: "/docs/workstream-health-index" },
+        { name: "Workstream Lifecycle",     path: "/docs/workstream-lifecycle" },
         { name: "Workstreams",              path: "/docs/workstreams" },
       ],
     },