Voice: WebRTC voice stage with useVoice and VendoStage

Voice is a UI entry point:

Entry	Contents
`@vendoai/ui/voice`	voice stage driver and surface
`useVoice()`	state, start, stop, and transcript
`<VendoStage />`	shipped voice surface

useVoice drives a WebRTC voice stage session. The shipped surface uses the same resolved theme tokens and accessibility requirements as the rest of the chrome. Tool calls initiated from voice still use the composition’s normal tool registry and guard treatment. Voice does not add a second authority path. The v0 wire does not define separate voice HTTP routes or provider environment variables. Configure the voice driver and its model provider in host code.

Persistence: Postgres schema and PGlite for local devHow Vendo's Postgres schema, default-on secret encryption, append-only audit, and eraseStore API work across PGlite dev and hosted production.

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