examples: use env -S so example shebangs work on Linux

[LeSingh1]

Summary

Three example scripts have a shebang of:

#!/usr/bin/env rye run python

This works on macOS BSD env, but on Linux /usr/bin/env does not split the interpreter spec on spaces and instead tries to exec a binary literally named "rye run python", which fails with bad interpreter: no such file or directory. The fix is to add the -S flag, which tells env to tokenize the rest of the line.

CONTRIBUTING.md already documents the correct form:

#!/usr/bin/env -S rye run python

and the rest of examples/ (async_demo.py, demo.py, streaming.py, video.py) already uses -S with the poetry/python runner. This PR brings the three remaining files in line.

Files touched

• examples/audio.py
• examples/speech_to_text.py
• examples/text_to_speech.py

Verification

Manual test on Linux confirms the previous form fails and the -S form executes the script. No SDK behavior change.

[LeSingh1]

Closing — I missed that #3210 already proposes the exact same fix (and is more complete, since it also covers examples/realtime/realtime.py). Sorry for the noise; please merge #3210.