fix(ci): resolve release pipeline conflicts and clean repo structure

- Delete conflicting .releaserc.json (keep release.config.cjs as single source)
- Fix repo URL from Draculabo/AntigravityManager to evandrodevbr/GeminiNexus
- Fix @semantic-release/git to commit pnpm-lock.yaml (not package-lock.json)
- Normalize Node.js version to 20 across all workflows
- Add packageManager field to package.json for pnpm consistency
- Update AGENTS.md: npm -> pnpm (18 references)
- Update .gitignore: add tools/, thoughts/, binaries, one-shot scripts

release.config.cjs

@@ -6,7 +6,7 @@
  * instead of Gitmoji (since the project history doesn't use emojis).
  */
 
-const REPO_URL = 'https://github.com/Draculabo/AntigravityManager';
+const REPO_URL = 'https://github.com/evandrodevbr/GeminiNexus';
 const GITHUB_BASE_URL = 'https://github.com';
 const FULL_CHANGELOG_URL = `${REPO_URL}/blob/main/CHANGELOG.md`;
 
@@ -244,7 +244,7 @@ const releaseConfig = {
     [
       '@semantic-release/git',
       {
-        assets: ['CHANGELOG.md', 'package.json', 'package-lock.json', 'npm-shrinkwrap.json'],
+        assets: ['CHANGELOG.md', 'package.json', 'pnpm-lock.yaml'],
         message: 'chore(release): ${nextRelease.version}\n\n${nextRelease.notes}',
       },
     ],