Voice Agent TestOps example PR ready for review

[monkeyin92]

I moved this out of the issue thread and into Discussions as the next channel-shift step.

Draft PR: #37

What it contains:

• docs/example-only Voice Agent TestOps sketch
• synthetic suite and sanitized transcript replay
• a local bridge shape using the existing agent/message and event surfaces
• no SIP/WebRTC/media runtime changes and no production credentials or private call data

If there is a preferred representative VoiceBlender flow you want the example to mirror more closely, I can adapt the synthetic suite around that. Otherwise, I will keep this as the reviewable public-safe baseline.