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>

mcp_server/TOOLS.md

@@ -58,6 +58,19 @@ Do not use them as a substitute for formal work definition inside the domain rep
 
 ---
 
+## Human Interventions
+
+Tasks that agents cannot complete themselves are flagged with `needs_human=True`.
+Use `list_human_interventions()` at session start to see Bernd's action items.
+
+| Tool | Key Args | Notes |
+|------|----------|-------|
+| `flag_for_human(task_id, note)` | `task_id`: UUID; `note`: action description (required) | Sets needs_human=True + intervention_note. Emits progress event. |
+| `clear_human_flag(task_id)` | `task_id`: UUID | Clears flag after human completes the action. Emits progress event. |
+| `list_human_interventions(workstream_id?)` | optional workstream filter | Returns all tasks with needs_human=True. |
+
+---
+
 ## Governance Tools
 
 | Tool | Key Args | When to use |