feat(tts): allow per-call provider override

[0xAdamFortuna]

Summary

• Allows text_to_speech callers to override the configured TTS provider for one request.

Test Plan

• uv run --python 3.11 --with pytest --with pytest-asyncio --with pytest-xdist python -m pytest -q -o 'addopts=' tests/tools/test_tts_command_providers.py::TestTextToSpeechToolWithCommandProvider

Notes

• Split from a local Hermes patch queue branch based on current upstream/main.
• Draft PR so maintainers can review the generic seam independently.

[teknium1]

Thanks for splitting out the TTS work. The new seam is not yet reachable from an actual Hermes TTS invocation.

Problems

• tools/tts_tool.py:2284 adds provider_override, but the registered tool schema still accepts only text and output_path (tools/tts_tool.py:2999-3015), and the handler forwards only those fields (tools/tts_tool.py:3022-3024). The new test covers a direct helper call, not the tool path.
• No existing system-owned caller uses the override: gateway auto-TTS still invokes the helper without it in gateway/platforms/base.py:5025-5027 and gateway/run.py:13309-13311.

Suggested changes

• Wire a named existing internal consumer that requires this selection and test that end-to-end, or remove the unused seam.
• Keep provider selection out of the model schema unless its documented user-configured ownership (tools/tts_tool.py:3001) is intentionally changed.

Automated hermes-sweeper review.

[teknium1]

provider_override is not forwarded by the registered text_to_speech handler, whose current schema exposes only text and output_path (tools/tts_tool.py:2999-3024); no in-tree caller passes this argument either. Please wire a concrete system-owned consumer and test that path, or avoid adding an unused seam.

[teknium1]

The per-call provider override landed in #73513 via @Cdddo's #47462, which was earlier and schema-exposed (matching the ask in #47459); your internal-only provider_override covered the same routing. Thanks for the contribution!

(Landed via #73513, merge 4aac89b429.) Closing.