**Fixes pre-existing syntax errors caught by the new validation:**
- bin/quality-gate.py: unterminated f-string literal (line 216)
- scripts/quality_gate_integration.py: unterminated string literal (lines 58, 144)
- scripts/cron_audit.py: unterminated string literal (line 176)
- scripts/token-tracker.py: global DB_PATH declared after use (line 177)
**New CI pipeline proof tests:**
- tests/test_ci_validation.py: 14 tests proving the pipeline catches broken
shell (bash -n), Python (py_compile), JSON, YAML, and cron files before
they reach main. Includes both positive (valid files pass) and negative
(broken files fail) fixtures.
**Workflow enhancements (.gitea/workflows/validate-config.yaml):**
- Added explicit syntax check for all shell scripts
- Added schema validation (required keys: jobs, name, schedule)
- Added job running the proof test suite
- Made shellcheck non-fatal () since bash -n is the baseline gate
**Documentation:**
- README.md: new 'CI Validation' section documenting what is checked,
how to run tests locally, and linking to the workflow files
Closes#289
