feat: Add DevLoop automation and HTML Reports

## DevLoop - Closed-Loop Development System
- Orchestrator for plan → build → test → analyze cycle
- Gemini planning via OpenCode CLI
- Claude implementation via CLI bridge
- Playwright browser testing integration
- Test runner with API, filesystem, and browser tests
- Persistent state in .devloop/ directory
- CLI tool: tools/devloop_cli.py

Usage:
  python tools/devloop_cli.py start 'Create new feature'
  python tools/devloop_cli.py plan 'Fix bug in X'
  python tools/devloop_cli.py test --study support_arm
  python tools/devloop_cli.py browser --level full

## HTML Reports (optimization_engine/reporting/)
- Interactive Plotly-based reports
- Convergence plot, Pareto front, parallel coordinates
- Parameter importance analysis
- Self-contained HTML (offline-capable)
- Tailwind CSS styling

## Playwright E2E Tests
- Home page tests
- Test results in test-results/

## LAC Knowledge Base Updates
- Session insights (failures, workarounds, patterns)
- Optimization memory for arm support study

knowledge_base/lac/optimization_memory/arm_support.jsonl

@@ -0,0 +1 @@
+{"timestamp": "2026-01-22T21:10:37.955211", "study_name": "stage_3_arm", "geometry_type": "arm_support", "method": "TPE", "objectives": ["displacement", "mass"], "n_objectives": 2, "design_vars": 3, "trials": 21, "converged": false, "convergence_trial": null, "convergence_ratio": null, "best_value": null, "best_params": null, "notes": ""}