docs: integrate autonomous migration slices

docs/DEVELOPER-GUIDE/architecture/README.md

@@ -10,19 +10,21 @@ This chapter is the canonical home for Mosaic Stack's system model, component bo
 - [`lease-broker-security.md`](lease-broker-security.md) — identity, ancestry, filesystem, whole-class, observer, and named residual security boundaries.
 - [`mutator-class-gate.md`](mutator-class-gate.md) — default-deny tool authorization, runtime adapters, launch choke point, and parser assurance boundary.
 - [`compaction-revocation.md`](compaction-revocation.md) — Claude/Pi observer lifecycle, runtime generations, revocation, and the bounded residual stale window.
+- [`channel-protocol.md`](channel-protocol.md) — current shared channel DTOs and Discord compatibility baseline, with unimplemented adapter work explicitly marked draft.
+- [`decisions/mos-runtime-portability-m1.md`](decisions/mos-runtime-portability-m1.md) — current logical identity, connector lease, grant, audit, and fencing decision; connector activation remains held.
 
 These pages are current security-contract references and are consumed by the lease-broker acceptance suites. Their live deployment gaps remain explicitly labeled in the pages; this migration does not change runtime behavior.
 
 ## Planned pages
 
-| Path                 | Purpose                                                               | Status         |
-| -------------------- | --------------------------------------------------------------------- | -------------- |
-| `system-overview.md` | Platform boundary and major request, event, and agent-runtime flows.  | Planned.       |
-| `component-map.md`   | Apps, packages, plugins, and dependency ownership.                    | Planned.       |
-| `data-flow.md`       | Data, event, and control-plane movement.                              | Planned.       |
-| `security-model.md`  | Trust boundaries, authority, authentication, and authorization model. | Planned.       |
-| `decisions/`         | Approved architecture decision records.                               | Scaffold only. |
-| `rfcs/`              | Proposals and protocol RFCs.                                          | Scaffold only. |
+| Path                                | Purpose                                                               | Status              |
+| ----------------------------------- | --------------------------------------------------------------------- | ------------------- |
+| `system-overview.md`                | Platform boundary and major request, event, and agent-runtime flows.  | Planned.            |
+| `component-map.md`                  | Apps, packages, plugins, and dependency ownership.                    | Planned.            |
+| `data-flow.md`                      | Data, event, and control-plane movement.                              | Planned.            |
+| `security-model.md`                 | Trust boundaries, authority, authentication, and authorization model. | Planned.            |
+| [`decisions/`](decisions/README.md) | Approved architecture decision records.                               | Partially migrated. |
+| `rfcs/`                             | Proposals and protocol RFCs.                                          | Scaffold only.      |
 
 Promoted pages must be linked here, from [`DEVELOPER-GUIDE/README.md`](../README.md), and from [`SITEMAP.md`](../../SITEMAP.md). Do not create duplicate architecture pages in `docs/mosaic-stack/` or the docs root.
 

docs/DEVELOPER-GUIDE/architecture/decisions/README.md

@@ -0,0 +1,15 @@
+# Architecture Decisions
+
+> **Status:** Current decision index. A decision describes an implemented and accepted boundary; draft proposals belong under `rfcs/` or `docs/plans/`.
+
+## Current decisions
+
+- [Mos runtime portability M1 — logical identity and fencing](mos-runtime-portability-m1.md) — implemented lease, grant, audit, policy, and fencing boundary; connector activation remains held.
+
+Decision pages do not override product requirements, API contracts, or executable behavior. Each page must identify implementation evidence, operational status, and explicit non-goals.
+
+## Related
+
+- [[DEVELOPER-GUIDE/architecture/README|Architecture index]]
+- [[PRD|Product requirements]]
+- [[ADMIN-GUIDE/operations/mos-connector-lease-operations|Held connector lease operations]]