python: bump kimi-cli to 1.37 and keep skills_dir compatibility

[wey-gu]

This updates the Python SDK to the current kimi-cli and kosong pair, and it fixes the one SDK-side break that shows up with newer kimi-cli.

What changed

• bump kimi-cli from 1.12.x to 1.37.x
• bump kosong from 0.42.x to 0.50.x
• refresh python/uv.lock
• keep the SDK's existing skills_dir parameter working while adapting to newer kimi-cli, which now expects skills_dirs
• add coverage for the compatibility layer in Session.create, Session.resume, and the high-level prompt(...) API

Why the SDK-side fix is needed
Newer kimi-cli changed the KimiCLI.create(...) parameter from skills_dir to skills_dirs. Without an adapter here, the dependency bump breaks the Python SDK at runtime with:

TypeError: KimiCLI.create() got an unexpected keyword argument 'skills_dir'

This keeps the old SDK surface working and also allows the newer list-based form.

Validation

• uv run --frozen pytest tests -q
• uv run --frozen pyright src tests

Notes

• This keeps the Python SDK backward-compatible for current callers using skills_dir=.
• The lockfile also picks up the current transitive versions that come with kimi-cli 1.37.0, including agent-client-protocol 0.8.0 and pykaos 0.9.0.

[wey-gu]

gently ping @RealKai42 :)