chat/voice: land voice answers on question carousels (fix Skipped)

[accnops]

Summary

Lets voice users answer VS Code chat question carousel multi-question forms (and approvals) by voice. Fixes the end-to-end break where a voice-spoken selection never landed and the card showed "Skipped".

Three commits, stacked on meganrogge/voice-mode-fixes:

1. respond_to_session answer/approval plumbing — voice tool dispatch routes question-carousel answers and approvals back into the chat session.
2. Complete agent-host carousels so voice answers land — agent-host carousels resolve only via their completion promise (carousel.dismiss(answers) → ChatInputCompleted), not the event the voice path fired. The answer branch now calls carousel.dismiss(toCarouselAnswers(answers)) in addition to notifyQuestionCarouselAnswer. An empty answer record maps to undefined so a genuine skip becomes Cancel rather than a truthy empty Accept. Adds a pure toCarouselAnswers helper + unit tests.
3. Guard against stale skip overwrite — after an external dismiss(), a later onDidSubmitRequest auto-skip could call handleSubmit(defaults) and overwrite the resolved answers. skip()/ignore() now also guard on carousel.isUsed. Adds 2 regression tests.

Testing

• tsc -p src/tsconfig.json --noEmit — 0 errors
• eslint on changed files — 0 errors
• Added unit + regression tests for toCarouselAnswers and the carousel skip/ignore guards.

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