feat(catalog): add repo-standard v0.1.0 to the marketplace

repo-standard was tagged and pushed in its own repo but never pinned here, so
its documented install command could not resolve for anyone (its own gate
reported ERROR INSTALL-NOT-IN-CATALOG against us).

Manifest entry added by hand (release-plugin.mjs rewrites an existing entry,
it cannot create one); the ref was written by release-plugin.mjs, not by hand.
README block written to catalog house style from the text repo-standard
proposed, with one correction: the gate composes TWELVE checks, not fourteen
(classifyRepo spreads 12 check* calls at v0.1.0, and their own README table
has 12 rows). Stats measured in an extraction of the v0.1.0 tag: 1 skill
(badge), 12 checks, 84 tests (node --test: tests 84 / pass 84).

check-versions.mjs: 12 plugins — 12 OK, 0 WARN, 0 ERROR, 0 SKIP.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01THEvHPWM11RupX24wBGKLu

.claude-plugin/marketplace.json

@@ -108,6 +108,15 @@
         "ref": "v0.20.2"
       },
       "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."
+    },
+    {
+      "name": "repo-standard",
+      "source": {
+        "source": "url",
+        "url": "https://git.fromaitochitta.com/open/repo-standard.git",
+        "ref": "v0.1.0"
+      },
+      "description": "Per-repo gate for the open/ presentation standard: README first screen, install block, files required by the repo's class, and dead repo references."
     }
   ]
 }