fix(newos4): second review round — identity for every stock node, load dedup, sweep race, a11y

Four models (kimi-k2.7-code, deepseek-v4-pro, minimax-m3, glm-5.3) reviewed the shipped change
set. Review log with every accepted and rejected finding:
.hermes/plans/2026-11-07_163420-newos4-six-ui-modes.review-log.md

- identity guard now covers every snapshot node, not just #terminal-container: terminal.js also
  binds #output, #command-input, #input-area and #status-bar, so a cloned one leaves the terminal
  writing into a detached node while the page looks perfect
- _restoreStock anchors on the next stock node already home, then on the recorded trailing
  sibling; a raw child index was measured wrong (terminal,input,status-bar,quick-actions)
- _loading map: a double-clicked card or a repeated 'ui easy' loads the mode once
- _sweepPending returns while that id is in flight instead of declaring failure at 6 s and
  overwriting the stored preference
- _syncChrome() on every switch (quick-actions was left in the tab order behind the mode root)
- picker: role=dialog/aria-modal/labelledby/focus, shown after 600 ms instead of waiting for a
  registration that never happens with lazy modes, and suppressed when ?ui= already applied
- ?ui= must be one of the six; _loadMode only accepts packages['ui-<id>']; hasOwnProperty on modes
- VFS names are shell-quoted before reaching api.exec (cat/edit)
- refresh generation no longer bumps per tick (slow captures left later panes at '...')
- easy: padding shorthand reset the 34 px footer reserve (footer overlapped the composer)
- cockpit panes get tabIndex and focus; F1/F12 left to the browser; nothing swallowed in inputs
- api.el lost its unused innerHTML sink; the test lost its _parseArgs stub (it hid the regression)
- v4.6.155

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