Implement post-triage operational hardening

AGENTS.md

@@ -63,8 +63,8 @@ Omit `workstream_id` / `task_id` when not applicable.
 ```bash
 curl -s -X PATCH "http://127.0.0.1:8000/tasks/<task_id>" \
   -H "Content-Type: application/json" \
-  -d '{"status": "in_progress"}'
-# values: todo | in_progress | done | blocked
+  -d '{"status": "progress"}'
+# values: wait | todo | progress | done | cancel
 ```
 
 ### Flag a task for human review
@@ -146,7 +146,7 @@ derived health labels, not frontmatter statuses.
 
 ` ` `task
 id: ACTIVITY-WP-NNNN-T01
-status: todo | in_progress | done | blocked
+status: wait | todo | progress | done | cancel
 priority: high | medium | low
 state_hub_task_id: "<uuid>"         # written by fix-consistency — do not edit
 ` ` `
@@ -154,7 +154,10 @@ state_hub_task_id: "<uuid>"         # written by fix-consistency — do not edit
 Task description text.
 ```
 
-Status progression: `todo` → `in_progress` → `done` (or `blocked`)
+Status progression: `todo` → `progress` → `done`; use `wait` for a task
+blocked on external input and `cancel` for intentionally abandoned work.
+Workstream/workplan lifecycle status is separate; frontmatter `blocked` remains
+valid there.
 
 To create a new workplan:
 1. Write the file following the format above