## Summary
This PR adds a Behave TDD bug-capture test that proves bug #1039 exists: the specification references `validations/unit-tests.yaml` as an example validation configuration file (Workflow Examples, Example 1, Step 1) but the file does not exist in the project's `examples/validations/` directory.
## Changes
- **New feature file:** `features/tdd_missing_validation_unit_tests_yaml.feature` — four scenarios tagged `@tdd_expected_fail @tdd_bug @tdd_bug_1039` that verify:
1. The file `examples/validations/unit-tests.yaml` exists
2. The YAML config contains `name: local/unit-tests`
3. The validation mode is `required`
4. The description field is non-empty
- **New step file:** `features/steps/tdd_missing_validation_unit_tests_yaml_steps.py` — step implementations that locate the project root and check file existence/content
All four scenarios currently fail with `AssertionError` (the file doesn't exist, proving the bug exists). The `@tdd_expected_fail` tag inverts the results so the test suite passes CI.
## Robot Integration Test
N/A — this bug is purely about a missing example file referenced by the specification. There is no integration-level behavior to test.
## Quality Gate Results
| Gate | Result |
|------|--------|
| `nox -s lint` | passed |
| `nox -s typecheck` | passed (0 errors) |
| `nox -s unit_tests` | 462 features, 12234 scenarios, 0 failures |
| `nox -s integration_tests` | 1672 tests, 0 failures |
| `nox -s e2e_tests` | 37 tests, 0 failures |
| `nox -s coverage_report` | 98% (>= 97% threshold) |
Closes#1103
Reviewed-on: cleveragents/cleveragents-core#1132
Reviewed-by: Jeffrey Phillips Freeman <jeffrey.freeman@cleverthis.com>
Co-authored-by: Brent E. Edwards <brent.edwards@cleverthis.com>
Co-committed-by: Brent E. Edwards <brent.edwards@cleverthis.com>
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