feat: wire retro-demoscene widgets into TUI app

[chernistry]

Summary

• Integrate 4 retro-demoscene widgets (CRT shader, plasma canvas, tracker view, oscilloscope) into the main BernsteinApp TUI
• Add Shift+C/P/T/O keybindings for toggling each widget
• Feed agent data from /status polling loop into visible retro widgets
• All widgets hidden by default; toggle on demand

Test plan

• uv run pytest tests/unit/test_app_retro_integration.py -x -q -- 2 passed
• uv run ruff format + uv run ruff check -- clean
• Pyright strict typecheck passes (pre-push hook)

🤖 Generated with Claude Code

[github-actions]

AI Review (GitHub Models)

Summary

The pull request introduces retro-demoscene widgets (CRT shader, oscilloscope, plasma canvas, and tracker) to the Bernstein TUI application, enhancing its interactive capabilities. The changes include feature integrations, binding keys for toggling the visibility of these widgets, and corresponding updates in the data flow. Unit tests have been added to verify the functionality of the CRT shader and ensure widget importability.

Risk Assessment

Medium: While the changes introduce meaningful features, they also add complexity to the application's state management and data flow, which could lead to potential bugs or performance issues. Additionally, user experience could be impacted if the toggling of visual elements is not intuitive.

Actionable Recommendations

• Code Clarity: Ensure that new methods related to the retro widgets are well-documented to enhance maintainability.
• User Experience: Review the key bindings for toggling widgets to ensure they do not conflict with existing shortcuts and are intuitive to use.
• **Performance

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• src/bernstein/tui/app.py - Integration logic for retro widgets
• tests/unit/test_app_retro_integration.py - Basic tests for widget integration

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_{Reviewed by grok-code-fast-1 · 109,473 tokens}

[sonarqubecloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

CI Summary

Check	Result
Repo hygiene	✅ success
Lint	✅ success
Type check	✅ success
Tests	❌ failure
Spelling	✅ success
Dead code	✅ success
Workflow lint	✅ success
Dist size	✅ success
SonarCloud	⏭️ skipped

Coverage and detailed reports are available via Codecov and the Checks tab.