chore(release): bump kimi-cli to 1.50.0

[sailist]

Summary

• Bump kimi-cli to 1.50.0
• Move the current release notes under 1.50.0
• Sync packages/kimi-code wrapper version and its kimi-cli==1.50.0 dependency pin

Validation

• uv run python scripts/check_version_tag.py --pyproject pyproject.toml --expected-version 1.50.0
• uv run python scripts/check_version_tag.py --pyproject packages/kimi-code/pyproject.toml --expected-version 1.50.0
• uv run python scripts/check_kimi_dependency_versions.py --root-pyproject pyproject.toml --kosong-pyproject packages/kosong/pyproject.toml --pykaos-pyproject packages/kaos/pyproject.toml
• make check

Post-merge

After this PR lands, create and push the release tag:

git tag 1.50.0
git push origin 1.50.0

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[devin-ai-integration]

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