docs: add architect role and template workflows

CHANGELOG.md

@@ -2,6 +2,51 @@
 
 All notable changes to this repository are tracked here.
 
+## 2026-04-11
+
+- Commit hash: pending (next commit)
+- Added `AM` (Architect Minion) as a first-class template role for architecture stewardship, system design review, and structural refinement in:
+  - `README.md`
+  - `INIT.md`
+  - `MEMORY.md`
+  - `docs/operator-onboarding-checklist.md`
+  - `docs/collaboration-playbook.md`
+  - `minions/roles/PM.md`
+  - `minions/roles/AM.md`
+  - `minions/roles/CM.md`
+  - `minions/roles/SM.md`
+  - `minions/roles/OM.md`
+  - `minions/chat/README.md`
+  - `minions/chat/general-thread-template.md`
+  - `minions/chat/topic-thread-template.md`
+- Strengthened shared git handoff discipline so every minion must commit before workflow handoff, cross-computer handoffs require commit-and-push, and the Operator records per-role handoff mode in:
+  - `INIT.md`
+  - `MEMORY.md`
+  - `docs/operator-onboarding-checklist.md`
+  - `docs/collaboration-playbook.md`
+- Added a vendored downstream-upgrade model with a PM-owned merge playbook and export manifest in:
+  - `README.md`
+  - `INIT.md`
+  - `MEMORY.md`
+  - `docs/collaboration-playbook.md`
+  - `docs/operator-onboarding-checklist.md`
+  - `docs/downstream-upgrade-playbook.md`
+  - `docs/export-manifest.md`
+  - `minion-version.md`
+  - `minions/roles/PM.md`
+- Added a separate downstream onboarding model so first-time adoption is treated as a controlled export from `.minions-template/`, not a blind repo copy, in:
+  - `README.md`
+  - `INIT.md`
+  - `MEMORY.md`
+  - `docs/collaboration-playbook.md`
+  - `docs/operator-onboarding-checklist.md`
+  - `docs/downstream-onboarding-playbook.md`
+  - `docs/downstream-upgrade-playbook.md`
+  - `docs/export-manifest.md`
+  - `minion-version.md`
+- Reconciled shared role-set drift so `SM` remains consistently present in handoff and `NEXT OWNER` contracts while adding `AM`
+- Bumped template version to `1.3.0-1.0.0` in `minion-version.md`
+
 ## 2026-04-10 (MM Bootstrap)
 
 - Commit hash: pending (next commit)