chore: prepare for release

- Add release-please workflow for automated version management
- Configure AMO publishing with API credentials
- Set up automated listing metadata
- Configure to start from zero releases

Author: seriousben

.github/workflows/release.yml

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+name: Release Please
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        id: release
+        with:
+          release-type: node
+          extra-files: |
+            src/manifest.json
+
+      - uses: actions/checkout@v4
+        if: ${{ steps.release.outputs.release_created }}
+
+      - uses: actions/setup-node@v4
+        if: ${{ steps.release.outputs.release_created }}
+        with:
+          node-version: 20
+          cache: npm
+
+      - run: npm ci
+        if: ${{ steps.release.outputs.release_created }}
+
+      - name: Unit tests
+        if: ${{ steps.release.outputs.release_created }}
+        run: npx vitest run
+
+      - name: Lint
+        if: ${{ steps.release.outputs.release_created }}
+        run: npx web-ext lint --source-dir=src
+
+      - name: Build
+        if: ${{ steps.release.outputs.release_created }}
+        run: npx web-ext build --source-dir=src --overwrite-dest
+
+      - name: Sign and submit to AMO
+        if: ${{ steps.release.outputs.release_created }}
+        run: npx web-ext sign --source-dir=src --channel=listed --amo-metadata=amo-metadata.json
+        env:
+          WEB_EXT_API_KEY: ${{ secrets.AMO_API_KEY }}
+          WEB_EXT_API_SECRET: ${{ secrets.AMO_API_SECRET }}
+
+      - name: Upload to GitHub Release
+        if: ${{ steps.release.outputs.release_created }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: gh release upload ${{ steps.release.outputs.tag_name }} web-ext-artifacts/*

.release-please-config.json

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+{
+  "release-type": "node",
+  "extra-files": [
+    {
+      "type": "json",
+      "path": "src/manifest.json",
+      "jsonpath": "$.version"
+    }
+  ],
+  "packages": {
+    ".": {
+      "changelog-sections": [
+        {"type": "feat", "section": "Features"},
+        {"type": "fix", "section": "Bug Fixes"},
+        {"type": "chore", "section": "Miscellaneous", "hidden": false}
+      ]
+    }
+  }
+}

CHANGELOG.md

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+# Changelog

amo-metadata.json

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+{
+  "categories": {
+    "firefox": ["tabs", "productivity"]
+  },
+  "summary": {
+    "en-US": "Keep your browser tabs organized with inbox zero methodology"
+  },
+  "description": {
+    "en-US": "# Tabs Zero\n\nBring inbox zero methodology to your browser tabs! Automatically close idle tabs, detect duplicates, and keep your browsing focused.\n\n## Features\n\n- **Auto-expire idle tabs** with configurable time thresholds (15 min to 30+ days)\n- **Smart duplicate detection** based on URL and title\n- **Protection for important tabs** (pinned, active, playing audio)\n- **Manual tab management** from popup (close individual tabs, switch to tabs)\n- **Tree Style Tab integration** for advanced tab management\n- **Detailed statistics** with helpful explanations\n\n## Perfect For\n\n- Heavy tab users who accumulate dozens of open tabs\n- Researchers and developers who need organized browsing\n- Anyone wanting to reduce memory usage and browser clutter\n- Users of inbox zero methodology\n\n## Privacy\n\nTabs Zero processes all data locally. No data is sent to external servers."
+  },
+  "tags": ["tabs", "productivity", "organization", "memory", "cleanup"],
+  "homepage": "https://github.com/seriousben/tabs-zero",
+  "support_url": "https://github.com/seriousben/tabs-zero/issues"
+}