docs(matrix): move migration guide from install/ to channels/

The Matrix migration guide is plugin-upgrade content (encrypted-state recovery,
device verification, room-key restore) rather than a cross-system import or
machine move, so it belongs alongside the Matrix channel docs rather than under
Install > Maintenance > Migrating.

- Move docs/install/migrating-matrix.md to docs/channels/matrix-migration.md
- Update inbound link in docs/channels/matrix.md
- Update the migrating.md hub: replace the Matrix Card with a one-line link in 'Upgrade a plugin in place'
- Refresh Related list on the moved page (link Matrix push rules and Migration guide hub)
- docs.json: remove install/migrating-matrix from Maintenance > Migrating, slot channels/matrix-migration between channels/matrix and channels/matrix-push-rules in the Mainstream channels group, and add a /install/migrating-matrix -> /channels/matrix-migration redirect

docs/channels/matrix-migration.md

@@ -361,9 +361,10 @@ openclaw matrix verify status
 
 If the device is still unverified after that, finish verification from your Matrix client by comparing the SAS emoji or decimal codes and confirming that they match.
 
-## Related pages
+## Related
 
-- [Matrix](/channels/matrix)
-- [Doctor](/gateway/doctor)
-- [Migrating](/install/migrating)
-- [Plugins](/tools/plugin)
+- [Matrix](/channels/matrix): channel setup and config.
+- [Matrix push rules](/channels/matrix-push-rules): notification routing.
+- [Doctor](/gateway/doctor): health check and automatic migration trigger.
+- [Migration guide](/install/migrating): all migration paths (machine moves, cross-system imports).
+- [Plugins](/tools/plugin): plugin install and registration.

docs/channels/matrix.md

@@ -401,7 +401,7 @@ Without `--account <id>`, Matrix CLI commands use the implicit default account.
 
     Startup also runs a conservative crypto bootstrap pass that reuses the current secret storage and cross-signing identity. If bootstrap state is broken, OpenClaw attempts a guarded repair even without `channels.matrix.password`; if the homeserver requires password UIA, startup logs a warning and stays non-fatal. Already-owner-signed devices are preserved.
 
-    See [Matrix migration](/install/migrating-matrix) for the full upgrade flow.
+    See [Matrix migration](/channels/matrix-migration) for the full upgrade flow.
 
   </Accordion>
 

docs/docs.json

@@ -52,6 +52,10 @@
     ]
   },
   "redirects": [
+    {
+      "source": "/install/migrating-matrix",
+      "destination": "/channels/matrix-migration"
+    },
     {
       "source": "/help/gpt54-codex-agentic-parity",
       "destination": "/help/gpt55-codex-agentic-parity"
@@ -984,8 +988,7 @@
                     "pages": [
                       "install/migrating",
                       "install/migrating-claude",
-                      "install/migrating-hermes",
-                      "install/migrating-matrix"
+                      "install/migrating-hermes"
                     ]
                   },
                   "install/uninstall",
@@ -1050,6 +1053,7 @@
                   "channels/imessage",
                   "channels/bluebubbles",
                   "channels/matrix",
+                  "channels/matrix-migration",
                   "channels/matrix-push-rules"
                 ]
               },

docs/install/migrating.md

@@ -117,13 +117,9 @@ On the new machine, confirm:
 
 ## Upgrade a plugin in place
 
-In-place plugin upgrades preserve the same plugin id and config keys but may move on-disk state into the current layout. The Matrix plugin is the largest example because of its encrypted-state recovery requirements.
+In-place plugin upgrades preserve the same plugin id and config keys but may move on-disk state into the current layout. Plugin-specific upgrade guides live alongside their channels:
 
-<CardGroup cols={1}>
-  <Card title="Matrix plugin migration" href="/install/migrating-matrix" icon="key">
-    Encrypted-state recovery limits, automatic snapshot behavior, and manual recovery commands for the Matrix plugin.
-  </Card>
-</CardGroup>
+- [Matrix migration](/channels/matrix-migration): encrypted-state recovery limits, automatic snapshot behavior, and manual recovery commands.
 
 ## Related