docs: ADR-007 and FDA playbook; finish WP-0009 (T11)

Absorb railiance01 pilot supplier notes into the forward-deployed engagement
playbook, accept ADR-007 elevating DEC-FDA-001, promote architecture and
business model to v1.0, and mark KAIZEN-WP-0009 finished.

CHANGELOG.md

@@ -12,10 +12,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `keepaTodofile` agent remains available for other projects
 
 ### Added
-- **`engagement` CLI (WP-0009 T08–T09)** — forward-deployed engagement lifecycle:
-  `list`/`show`/`validate`/`checklist`/`phase`/`prepare`/`staff`/`quote`/
-  `scrub`/`export-handoff`/`close-session` over file-based pilots
-  (`engagements/pilots/`); close-session wires vault log, metrics, and Kai ledger
+- **Forward-deployed agency (WP-0009)** — staffed Role engagements with Kai trial
+  currency, client vaults, ramp-up/down; pilot host-operator @ railiance01
+- **ADR-007** — forward-deployed engagement convention; playbook
+  `docs/integrations/forward-deployed-engagement-playbook.md`
+- **`roles/host-operator`** — Role package (sys-medic craft base)
+- **`engagement` CLI** — `list`/`show`/`validate`/`checklist`/`phase`/`prepare`/
+  `staff`/`quote`/`scrub`/`export-handoff`/`close-session` over
+  `engagements/pilots/`; close-session wires vault log, metrics, and Kai ledger
 - **`metrics record --emit-event`** — publishes `kaizen.metrics.recorded` NATS
   envelope for activity-core event-driven definitions (optional `nats-py` via
   `pip install 'kaizen-agentic[events]'`)