[codex] add live voice session scaffold

[Rumblingb]

What changed

This adds the first production-facing live voice session seam for Ace instead of relying only on the older record-upload-transcribe-playback loop.

The change introduces:

• a voice session manifest and LiveKit token endpoint on the edge runtime
• Meridian-side live voice bootstrap and room connection logic
• explicit runtime awareness in the converse surface so Ace can distinguish a true live session from the fallback batch path
• an explicit contract that planning stays available during conversation while booking remains locked until explicit confirmation
• LiveKit / WebRTC package wiring in the Meridian app config

Why it changed

Ace should feel like one persistent concierge presence, not a recorder stitched to a voice player. The current trust seam around payment approval was already correct, but the transport/runtime seam was still batch-shaped.

This PR creates the clean upgrade path to a persistent WebRTC voice session while preserving the current fallback behavior when live runtime credentials are unavailable.

Impact

User impact:

• when live voice runtime is configured, Meridian can join a persistent voice room and publish microphone audio instead of only using the upload-based STT path
• presence copy and telemetry now reflect whether Ace is truly live or on fallback
• booking remains gated behind explicit confirmation

Developer impact:

• LiveKit / WebRTC dependencies are now declared in Meridian
• the edge runtime now exposes voice session readiness plus LiveKit participant token minting

Root cause

The app had a calm confirmation flow, but the actual voice runtime was still request-response oriented: local recording, server STT, then separate TTS fetch/playback. That transport shape made Ace feel older than the product promise.

Validation

• npx tsc --noEmit -p /Users/baskar_viji/Agentpay/apps/meridian/tsconfig.json
• npx tsc --noEmit -p /Users/baskar_viji/Agentpay/apps/api-edge/tsconfig.json
• npx pod-install in apps/meridian/ios
• started xcodebuild -workspace /Users/baskar_viji/Agentpay/apps/meridian/ios/Ace.xcworkspace -scheme Ace -configuration Debug -sdk iphonesimulator -destination 'generic/platform=iOS Simulator' build

Notes

• I intentionally did not include the unrelated root package.json / package-lock.json changes that were already present in the worktree before this work.
• The checked-in change is the cross-platform/runtime seam. The local iOS shell was updated to prove the native integration path, but that directory is not tracked in this repository.

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Project	Deployment	Actions	Updated (UTC)
agentpay-dashboard	Ready	Preview, Comment	Apr 10, 2026 11:36am
agentpay-docs	Ready	Preview, Comment	Apr 10, 2026 11:36am