feat: competitive upgrade - tests, CI, examples, professional README (#2)

- Add 61-test suite covering config, helpers, locks, categories, schema, language
- Add GitHub Actions CI with shellcheck, tests, and language enforcement
- Rewrite README with architecture diagram, competitor comparison, FAQ
- Add examples directory with sample report, scheduling config, multi-repo setup
- Add CHANGELOG.md tracking all versions
- All code verified English-only

Co-authored-by: Frederik <fvdh@gmx.de>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

.github/workflows/ci.yml

@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main]
+
+jobs:
+  shellcheck:
+    name: Shellcheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install shellcheck
+        run: sudo apt-get install -y shellcheck
+      - name: Run shellcheck
+        run: |
+          shellcheck -S warning config.sh coordinator.sh worker.sh summary.sh summary-morning.sh lesson-generator.sh install.sh
+
+  test:
+    name: Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Make scripts executable
+        run: chmod +x *.sh tests/*.sh
+      - name: Run tests
+        run: ./tests/test-nightshift.sh
+
+  language-check:
+    name: English Only
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check for non-English strings
+        run: |
+          GERMAN=$(grep -rlE 'ä|ö|ü|ß' --include='*.sh' . || true)
+          if [[ -n "$GERMAN" ]]; then
+            echo "Files with German characters:"
+            echo "$GERMAN"
+            grep -rnE 'ä|ö|ü|ß' --include='*.sh' .
+            exit 1
+          fi
+          echo "All clear — no German strings found."

CHANGELOG.md

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+# Changelog
+
+All notable changes to Night Shift will be documented in this file.
+
+## [0.3.0] - 2026-08-02
+
+### Added
+- Test suite (`tests/test-nightshift.sh`) covering config parsing, helper functions, lock mechanism, task categories, schema validation, and language checks
+- GitHub Actions CI with shellcheck, tests, and English-only enforcement
+- Example files: morning report, crontab configurations, multi-repo setup
+- Architecture diagram in README
+- Comparison table: Night Shift vs Devin vs CodeRabbit vs Sweep
+- FAQ section in README
+- Extending Night Shift guide for custom task categories
+
+### Changed
+- README rewritten for competitive positioning and clarity
+- Worker resolves repo paths from REPOS array (supports absolute paths)
+- Improved stash handling with recovery instructions on failure
+
+## [0.2.0] - 2026-08-01
+
+### Added
+- Lesson generator for educational content from completed fixes
+- Morning summary with automatic catch-up for missed summaries
+- ntfy.sh notification support
+- Install script with dependency checks and cron setup
+- Security fix fallback: individual package upgrades when `npm audit fix` is ineffective
+- Build verification (Next.js) after dependency updates
+- RAM monitoring with configurable threshold
+- Task timeout with TERM signal handling
+- LLM output length guard for docs fixes
+
+### Changed
+- Worker stashes uncommitted changes instead of skipping repos
+- Security fixes include TypeScript compilation check with rollback
+
+## [0.1.0] - 2026-07-25
+
+### Added
+- Initial release
+- Coordinator with multi-repo scanning
+- Worker with lint-fix, type-fix, security, docs categories
+- PostgreSQL schema for runs, tasks, lessons
+- Ollama integration for local LLM analysis
+- Claude API support (optional)
+- Branch-per-fix workflow with backup tags
+- Lockfile-based concurrency prevention