feat: engagement CLI for forward-deployed agency (WP-0009 T08)

Add kaizen-agentic engagement subcommands (list, show, validate, checklist,
phase, prepare, staff, quote, scrub, export-handoff) backed by engagement.py
for file-based pilot lifecycle. Tests cover staff/validate/phase/prepare and
the railiance01 pilot smoke path.

workplans/kaizen-agentic-WP-0009-forward-deployed-agency.md

@@ -36,7 +36,7 @@ tasks:
     status: done
     title: JSONL Kai ledger convention and quote snapshot for pilot
   - id: T08
-    status: todo
+    status: done
     title: CLI engagement command group (request, staff, prepare, checklist, scrub)
   - id: T09
     status: todo
@@ -186,18 +186,17 @@ with quote-open note, commercial README.
 
 ```task
 id: KAIZEN-WP-0009-T08
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "52f7d872-1087-4890-9439-8d6c704351fd"
 ```
 
-Implement `kaizen-agentic engagement` subcommands (Phase 2 of architecture):
+**Delivered:** `kaizen-agentic engagement` CLI group + `engagement.py` module:
 
-`request`, `quote`, `staff`, `render-agent`, `init-vault`, `phase`, `checklist`,
-`prepare`, `scrub`, `export-handoff` — minimum viable subset for pilot may be
-`staff`, `checklist`, `prepare`, `phase`.
+`list`, `show`, `validate`, `checklist` (+ `--mark`), `phase`, `prepare`,
+`staff`, `quote`, `scrub`, `export-handoff`.
 
-Tests for schema validate and checklist status.
+Tests: `tests/test_engagement_cli.py`. Docs: CLI cheat sheet section.
 
 ## Session wire-up