feat(app): add Voice Mode extension

[benjaminshafii]

Summary

• Add a Voice Mode OpenWork extension with a right-side Realtime voice panel.
• Add host-side OpenAI Realtime client-secret minting using the existing env store.
• Prefer user-saved env-store Realtime keys over stale process env keys.
• Keep Voice Mode panel and runtime state open across session changes so the voice timeline survives navigation/new sessions.
• Extend OpenWork UI MCP with inspect/assert/wait tools for deterministic evals.
• Add Voice Mode eval docs covering transcript injection, Realtime text tool calls, audio-buffer transcription, and session-transition continuity.

Verification

• pnpm --filter @openwork/app typecheck
• pnpm --filter openwork-server typecheck
• pnpm --filter openwork-ui-mcp check
• git diff --check
• Isolated Electron/CDP eval on local feature worktree: connected OpenWork UI Control, verified opencode.jsonc MCP config, reloaded MCP, verified UI MCP can navigate/open Voice Mode.
• Real OpenAI Realtime eval with local OPENAI_API_KEY env: verified Realtime connection, model called openwork_execute_action, composer changed to REPEAT CHAT EVAL PASSED.
• Direct OpenAI Realtime client-secret verification with temporary key: returned 200 and a client secret.
• Realtime audio-buffer eval: injected PCM16 hello-world audio and verified Realtime transcription produced Hello world.
• Exact session-transition CDP eval: opened Voice Mode, injected FIRST VOICE MESSAGE MUST REMAIN, created a new session, verified the first voice message still remained visible in the Voice timeline, then injected SECOND SESSION MESSAGE into the new session composer.

Notes

• Did not include API keys or eval temp artifacts in the commit.
• Chromium fake microphone flags were silent locally, so deterministic audio eval uses Realtime input_audio_buffer injection.

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