html-structure-validatelisted

# HTML Structure Validate Skill ## Purpose This skill is a **BLOCKING quality gate** that ensures generated HTML meets minimum structural requirements. It is the **first deterministic validation** of probabilistic AI-generated output. The skill checks: - **HTML5 compliance** - Proper DOCTYPE, tags - **Tag closure** - All tags properly closed - **Required elements** - Meta tags, stylesheet links - **Well-formedness** - Valid structure If validation fails, the pipeline **STOPS** and triggers a hook to notify the user. This enforces the principle: **Python validates, ensuring deterministic quality**. ## What to Do 1. **Load HTML file to validate** - Read `04_page_XX.html` generated by AI skill - Verify file exists and is readable - Confirm file is text (not binary) 2. **Run validation checks** - Check HTML5 structure compliance - Verify tag closure - Validate head section - Check required CSS link - Validate page container structure 3. **Generate validation report** - Document all checks performed - List any errors found - Note warnings (non-blocking) - Record informational findings 4. **Save validation report** as JSON - Save to: `output/chapter_XX/page_artifacts/page_YY/06_validation_structure.json` - Include timestamp - Include all check results 5. **Exit with appropriate code** - Return 0 if VALID (continue pipeline) - Return 1 if INVALID (STOP pipeline, trigger hook) ## Input Parameters ``` html_file: <str>