feat: remove changelog and git plugins from semantic-release (#6)

## Summary

- Remove `@semantic-release/changelog` and `@semantic-release/git` from
the release pipeline
- Branch protection prevents semantic-release from pushing directly to
main
- GitHub Releases (via `@semantic-release/github`) are sufficient for
changelog

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dogmar

.releaserc.json

@@ -13,21 +13,13 @@
         "preset": "conventionalcommits"
       }
     ],
-    "@semantic-release/changelog",
     [
       "@semantic-release/npm",
       {
         "pkgRoot": "package",
         "provenance": true
       }
     ],
-    [
-      "@semantic-release/git",
-      {
-        "assets": ["CHANGELOG.md", "package/package.json"],
-        "message": "chore(release): ${nextRelease.version} [skip ci]"
-      }
-    ],
     "@semantic-release/github"
   ]
 }

package.json

@@ -9,8 +9,6 @@
     "prepare": "vp config"
   },
   "devDependencies": {
-    "@semantic-release/changelog": "catalog:",
-    "@semantic-release/git": "catalog:",
     "@types/node": "catalog:",
     "conventional-changelog-conventionalcommits": "catalog:",
     "semantic-release": "catalog:",