feat: Agentic QE Fleet v2.0.0 - 14-agent quality engineering platform

- 14 specialized AI agents across 5 battle zones (Prepare/Analyze/Design/Review/Monitor)
- New: risk-assessor, test-strategist, data-builder, coverage-auditor, quality-gatekeeper, execution-analyst, knowledge-curator
- New: fleet_runner.py orchestrator with multi-zone manifest pipeline
- New: fleet_config.yml for centralized configuration
- New: knowledge activation system (keyword + semantic matching)
- New: semantic conflict detection with severity grading (P0-P3)
- New: three-tier quality gate (PASS/PASS_WITH_FIX/BLOCKED)
- New: monitor zone for test execution analysis and auto knowledge curation
- Backward compatible: /case_generate alias, case_pipeline.py preserved
- Comprehensive docs: USER_GUIDE.md + MAINTENANCE_GUIDE.md

.gitignore

@@ -0,0 +1,6 @@
+.DS_Store
+__pycache__/
+.venv/
+*.pyc
+output/excel_reports/
+