fix(tests): grep -c count duplication on zero matches (#4)

* feat: competitive upgrade - tests, CI, examples, professional README

- 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: Claude Opus 4.6 <noreply@anthropic.com>

* fix: resolve CI failures (shellcheck, language check)

- Fix SC2155: declare and assign separately in worker.sh, coordinator.sh
- Fix SC2034: suppress unused-var warnings in config.sh (sourced file)
- Fix language check: use byte-level grep to avoid self-detection in tests
- Rename unused read vars with _ prefix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(tests): grep -c already outputs 0 on no match, || echo "0" duplicated it

The shellcheck test captured "0\n0" instead of "0" because grep -c
outputs the count (0) even on exit code 1, then || echo "0" added
a second zero. Changed to || true.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016Sw2Ti3a4Ad8U6JuAyNib1

---------

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

Author: 3 people

tests/test-nightshift.sh

@@ -290,7 +290,7 @@ if command -v shellcheck &>/dev/null; then
   for script in config.sh coordinator.sh worker.sh summary.sh summary-morning.sh lesson-generator.sh install.sh; do
     TESTS_RUN=$((TESTS_RUN + 1))
     sc_output=$(shellcheck -S warning "$PROJECT_DIR/$script" 2>&1 || true)
-    sc_errors=$(echo "$sc_output" | grep -c "^In " || echo "0")
+    sc_errors=$(echo "$sc_output" | grep -c "^In " || true)
     if [[ "$sc_errors" -eq 0 ]]; then
       TESTS_PASSED=$((TESTS_PASSED + 1))
       echo -e "  ${GREEN}PASS${NC} shellcheck: $script"