fix: complete sensing server API, WebSocket connectivity, and mobile tests

[ruvnet]

Problem

The web UI at http://localhost:3000/ui/ had multiple issues:

1. 404 errors on 4 API endpoint groups: /api/v1/models, /api/v1/models/active, /api/v1/recording/list, /api/v1/train/status
2. WebSocket "RECONNECTING" on Dashboard and Live Demo tabs — sensingService.start() was only called lazily on Sensing tab visit
3. Mobile WebSocket hardcoded to port 3001 instead of same-origin
4. Jest config silently skipped all 25 mobile tests
5. All 25 mobile tests were it.todo() placeholders

Solution

• 14 new Axum handler functions in main.rs (model 7, recording 4, training 3)
• sensingService.start() called on app init in app.js
• Mobile ws.service.ts uses parsed.host for same-origin port
• Jest testPathIgnorePatterns fixed
• 25 real test implementations replacing placeholders
• ADR-043 documents all changes

PR

#125

[ruvnet]

Fixed in #125 (merged to main).