skillprobe 0.5.0: skill combination testing

chore: bump version to 0.4.0

Cursor adapter verified, init removed, write-tests skill, good/bad
skill examples, all verified e2e.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

chore: bump version to 0.3.0

Cursor adapter verified, activation testing via tool call detection,
multi-turn support, all examples verified e2e.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

chore: bump version to 0.2.0

Multi-run support, demo GIF, tightened README.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

docs: add security considerations, bump to 0.1.1

docs: rewrite README for PyPI release, remove proxy references

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>