chore: release v2.4.2 — register push-gate, auto-skill visibility

- bump version 2.4.1 → 2.4.2
- register skills/push-gate in components.skills (shipped in f6d8306
  but was never added to the manifest, so it wasn't being distributed
  via the plugin marketplace)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mods",
-  "version": "2.4.1",
+  "version": "2.4.2",
   "description": "Custom commands, skills, and agents for Claude Code - session continuity, 23 expert agents, 68 skills, 3 commands, 5 rules, 4 hooks, 13 output styles, modern CLI tools",
   "author": "0xDarkMatter",
   "repository": "https://github.com/0xDarkMatter/claude-mods",
@@ -84,6 +84,7 @@
       "skills/perf-ops",
       "skills/postgres-ops",
       "skills/project-planner",
+      "skills/push-gate",
       "skills/python-async-ops",
       "skills/python-cli-ops",
       "skills/python-database-ops",