feat(core): adopt Hermes realtime voice contract

[kvnloo]

Summary

• adapt OpenAI and xAI realtime transports to the provider/session contract in feat(voice): add realtime provider session contract NousResearch/hermes-agent#95147
• register the configured Talk provider through Hermes plugin context
• run terminal voice through Hermes' coordinator when the contract is available
• expose only client_delegate in TUI event-stream mode so the normal Hermes agent owns coding, tools, approvals, and detailed output
• return silent progress and concise final-result context to the voice session

Stack

Depends on NousResearch/hermes-agent#95147 and the stacked Hermes TUI consumer PR.

Related to NousResearch/hermes-agent#77111.

Verification

• focused adapter, registration, CLI bridge, and wheel-manifest suite — 41 passed
• ruff check . — passed
• exact regression covers: “Write a Python script that sums all numbers from 1 to 100 and run it”, progress framing, 32-character provider item IDs, and final result 5050

[kvnloo]

Review wave complete. Fixed multi-tool result batching/continuation ordering, xai-oauth resolver use, queued-playback barge-in identity, cancellable stdin teardown, bounded CLI error handling, and recoverable provider failures in f70e45e. Verification: 30 passed, 5 skipped across adapter/CLI/registration/manifest tests; Ruff clean.