chore(catalog): bump repo-mailbox v0.22.0 -> v0.23.0

Post-write gate caught the selftest-check stat line stale again (412 -> 433,
read from the plugin's own badge at v0.23.0). Tag minted+pushed on bf11cbf.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RQPdPvk1pnB1MNdsvUanFD

.claude-plugin/marketplace.json

@@ -105,7 +105,7 @@
       "source": {
         "source": "url",
         "url": "https://git.fromaitochitta.com/open/repo-mailbox.git",
-        "ref": "v0.22.0"
+        "ref": "v0.23.0"
       },
       "description": "Local mailbox for coordination between Claude Code sessions in different repositories — directed messages and broadcasts injected as context at session start. Local, private, no network."
     },

README.md

@@ -185,7 +185,7 @@ End-to-end facilitator for prompting Claude Design (`claude.ai/design`). Walks y
 
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-### [repo-mailbox](https://git.fromaitochitta.com/open/repo-mailbox) `v0.22.0`
+### [repo-mailbox](https://git.fromaitochitta.com/open/repo-mailbox) `v0.23.0`
 
 A local mailbox for coordination between Claude Code sessions in different repositories. Session A in repo X leaves a message for repo Y; the next session in repo Y gets it injected as context at startup. Local, private, no network, no SaaS.
 
@@ -195,7 +195,7 @@ A local mailbox for coordination between Claude Code sessions in different repos
 - **`board`** — read-only cross-repo attention board: which repos have a live next step, which are blocked and on whom, which owe a reply, and what each costs to move
 - **`route`** — turns four scored traits of the next task into a model/effort row from a closed six-row rubric, with a pasteable startup command and a one-row-cheaper fallback
 
-1 hook · 3 skills · 8 CLI scripts · 412 selftest checks · [Full documentation →](https://git.fromaitochitta.com/open/repo-mailbox)
+1 hook · 3 skills · 8 CLI scripts · 433 selftest checks · [Full documentation →](https://git.fromaitochitta.com/open/repo-mailbox)
 
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