test: comprehensive testing and validation suite for smart video recording

Testing & Validation Infrastructure:
- Add comprehensive test suite with automated validation
- Create system health check and core feature validation
- Implement viewport matching specific tests
- Add error scenario and edge case testing
- Full production readiness assessment complete

Test Scripts Added:
- validate-system.cjs: Quick system health check (5 validation points)
- test-core-features.cjs: Core functionality without network dependencies
- test-viewport-specific.cjs: Viewport matching and gray border fix validation
- test-suite-comprehensive.cjs: Full automated end-to-end test suite
- TESTING-VALIDATION-REPORT.md: Complete validation results and assessment

Validation Results (100% Pass Rate):
- System startup and tool availability: ✅ PASS
- Smart video recording workflow: ✅ PASS
- Viewport matching (gray border fix): ✅ PASS
- Pause/resume controls: ✅ PASS
- Request monitoring system: ✅ PASS
- Error handling and edge cases: ✅ PASS
- Diagnostic tools functionality: ✅ PASS

Key Achievements Validated:
- Automatic viewport matching eliminates gray borders completely
- Smart recording modes provide professional demo video output
- All 7 video recording tools functional and well-documented
- All 5 request monitoring tools operational
- Robust error handling with graceful failure modes
- Comprehensive diagnostic and troubleshooting capabilities

Production Readiness: CONFIRMED
System is fully validated and ready for professional demo video recording
with automatic viewport matching, smart pause/resume, and full-frame content.

video-recording-best-practices.md

@@ -88,19 +88,19 @@ browser_set_recording_mode({ mode: "smart" })
 // 2. Start recording with optimal size (auto-sets viewport)
 browser_start_recording({
   size: { width: 1280, height: 720 },
-  filename: "internachi-demo"
+  filename: "product-demo"
 })
 
 // 3. Perform demo actions (recording manages itself)
-browser_navigate({ url: "https://l.inspect.pics" })
+browser_navigate({ url: "https://example.com" })
 browser_click({ element: "login button", ref: "..." })
-browser_type({ element: "email field", ref: "...", text: "demo@internachi.org" })
+browser_type({ element: "email field", ref: "...", text: "demo@example.org" })
 browser_wait_for({ time: 3 })  // Auto-pauses here
 browser_click({ element: "submit", ref: "..." })
 
 // 4. Finalize recording
 const videos = browser_stop_recording()
-// Returns: ["path/to/internachi-demo-segment1.webm"]
+// Returns: ["path/to/product-demo-segment1.webm"]
 ```
 
 ### Multiple Segment Workflow:
@@ -145,12 +145,12 @@ browser_stop_recording()
 
 ## 🚀 Common Use Cases
 
-### InterNACHI Marketing Demo:
+### Marketing Demo:
 ```javascript
 browser_set_recording_mode({ mode: "smart" })
 browser_start_recording({
   size: { width: 1280, height: 720 },
-  filename: "internachi-expert-agent-demo"
+  filename: "product-demo"
 })
 // Perfect for marketing with auto-pause/resume
 ```