docs: track migration implementation lanes

docs/scratchpads/DOCS-IA-002-catalog-audit.md

@@ -33,6 +33,17 @@ The four isolated worktrees were clean and removed after report collection.
 | `docs-reports` | Classify archived reports/checklists into exact evidence/archive destinations and identify references that must move with them.                              | Complete — 13 evidence artifacts classified; the byte-identical #756 batch was selected and migrated.                                                                                   |
 | `docs-guides`  | Identify the next safe user/admin/developer guide slices, verifying commands and held PostgreSQL/runtime boundaries.                                         | Complete after automatic compaction — upgrade/recovery is the next safe rewrite; deployment, tier migration, Gateway/Web activation, and PostgreSQL remain held.                        |
 
+### Implementation lanes
+
+| Lane                | Branch                            | Owned slice                                            | State    |
+| ------------------- | --------------------------------- | ------------------------------------------------------ | -------- |
+| `docs-channel-impl` | `docs/channel-protocol-migration` | Rewritten current channel architecture page only.      | Running. |
+| `docs-runtime-impl` | `docs/runtime-m1-migration`       | M1 decision and held connector-lease operations guide. | Running. |
+| `docs-upgrade-impl` | `docs/upgrade-recovery-migration` | Verified local upgrade/recovery administrator guide.   | Running. |
+| `docs-reports-impl` | `docs/report-evidence-migration`  | Four byte-identical historical evidence moves.         | Running. |
+
+Shared indexes, navigation, audit records, integration review, and final commits remain coordinator-owned.
+
 ## Progress
 
 - [x] Confirmed external fleet sessions are standing down; no shared agent session was repurposed.