feat(vc-agent): add Botmux meeting listener and agent consumer flow

[sensuossss]

Summary

• Add VC meeting listener runtime: bot invite handling, bot join, activity ingestion, transcript/chat normalization, listener group sync, ended cleanup, tombstones, and restart restore.
• Add meeting consumer flow: listener group selection card, configurable sync interval, cross-daemon agent injection, catch-up before user @agent turns, compact meeting envelope, and output approval gates.
• Add meeting text output and realtime voice path: request-output IPC, review cards, meeting-message send, realtime voice session wiring, output policies, and trusted-operator checks.
• Add dashboard/global settings: machine-wide VC listener switch, listener bot identity selection with validation, permission readiness checks, and interactive documentation source.
• Remove obsolete VC workflow trigger helper and add focused tests for daemon, runtime store, realtime protocol, dispatcher, dashboard IPC, settings, and permissions.

Validation

• pnpm exec tsc --noEmit
• pnpm exec vitest run test/global-config.test.ts test/settings-write-applier.test.ts test/vc-meeting-daemon-session.test.ts test/event-dispatcher.test.ts test/daemon-internal-api.test.ts test/daemon-internal-smoke.test.ts test/trigger-api.test.ts test/bot-registry.test.ts test/setup-verify-permissions.test.ts test/vc-agent.test.ts test/vc-realtime-voice.test.ts test/vc-meeting-runtime-store.test.ts test/daemon-discovery.test.ts
• pnpm build

Dogfood Notes

• Manual invite -> bot join -> listener group -> transcript sync -> ended cleanup passed.
• Agent selection -> cross-daemon injection -> @agent catch-up passed.
• Meeting text send passed after vc:meeting.message:write scope.
• Realtime voice M0 passed in a live meeting.
• Restart restore passed during meeting dogfood.

Known Follow-ups

• Restore-time polling reconcile for ended events missed while daemon is down.
• Listener group live dashboard card / less noisy human-readable sync.
• Final summary consumer based on rolling summary or full transcript.
• User-identity ambient listener remains deferred.