feat: W1 frontend — index.html, style.css, keybar, main.ts (esbuild entry)
- T8 public/index.html — #term/#keybar, loads ./build/main.js (type=module)
- T9 public/style.css — fullscreen term, keybar fixed bottom, hidden >768px
- T10 public/keybar.ts — key→byte map + mountKeybar (13 tests)
- T11 public/main.ts — xterm+fit, WS client (wss on https/M6), reconnect
backoff, resize debounce, mountKeybar wiring
Verified by orchestrator: backend+frontend tsc clean; full suite 141 tests;
npm run build:web bundles main.ts -> public/build/main.js (430kb).
Note: main.ts uses one @ts-ignore for the CSS import (minor; future: *.css d.ts).
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