fix(tts): make schema default output path profile-safe

[276970789]

Fixes #7697

What changed

• Make text_to_speech schema output_path default path hint HERMES_HOME/profile-aware.
• Add a unit test to prevent hardcoded ~/.hermes defaults in schema strings.

How to test

pytest tests/tools/test_tts_schema_paths.py -q

[teknium1]

Thanks for the contribution! This fix has already landed on main via #10285 (commit 722331a57).

• tools/tts_tool.py line 1499: the output_path schema description now uses display_hermes_home() instead of a hardcoded ~/.hermes, exactly as proposed here.
• The display_hermes_home import is present at line 44 of the same file.

The regression test file (tests/tools/test_tts_schema_paths.py) from this PR was not included in that earlier commit. If you'd like to open a focused follow-up PR adding just the test, that would be a welcome addition.

This is an automated hermes-sweeper review.