fix(bridge): send room approval request_id

[danclaw93]

What and why

Room-scoped approvals require the exact request_id, but respond_to_approval() sends that identifier as approvalId. Current Hermes therefore rejects spoken approval responses with HTTP 400 approval_request_required, leaving the pending action blocked.

Send the approval event identifier under the Hermes run API's request_id field and update the surrounding contract documentation and regression expectation.

Fixes #120

How to test

The regression test was changed first and failed on main because the emitted payload still contained approvalId:

AssertionError: {'choice': 'once', 'approvalId': 'req-77'} != {'choice': 'once', 'request_id': 'req-77'}

With this fix:

env -u TALK_PREFER_CODEX_OAUTH uv run --extra dev pytest -q tests/test_approval_bridge.py::test_respond_to_approval_carries_the_request_id_when_given
env -u TALK_PREFER_CODEX_OAUTH uv run --extra dev pytest -q
uv run --extra dev ruff check .

1 passed
1671 passed, 49 skipped, 5 xfailed
All checks passed!

An integration check using the real Talk request builder and current Hermes approval handler also returned HTTP 200 with resolved: 1 for the room-scoped request.

Platforms

• Windows
• Linux
• macOS

Live receipt

Not required: this changes the local Hermes run-approval API payload, not a provider lane, credential-resolution path, or delegation implementation. The Talk-to-Hermes handler integration was exercised locally with an inert pending approval and temporary HERMES_HOME.

Checklist

• One logical change; tests ride with it, not behind it
• pytest -q and ruff check . pass locally on the pinned ruff
• Commits follow Conventional Commits with a hermes-talk scope
• No auth-store writes outside the documented Codex refresh; tokens reach only the provider's own host
• Nothing secret in logs, receipts, spoken sentences, or test fixtures
• Every spoken sentence I added or changed claims only what an artifact proves
• Docs updated where behaviour changed — code contract comments updated; user-facing operating and voice docs are N/A
• CHANGELOG.md [Unreleased] entry added