chore(release): bump version to 0.9.3

Merge pull request #121 from kayba-ai/feat/pydantic-ai-migration

refactor: remove TagStep (skill tag counters no longer exist)

fix(mypy): remove dead tag_skill call and annotate MCP handler list

fix(mcp): handle removed helpful/harmful/neutral fields on Skill

fix(provenance): restore error_identification and learning_text on InsightSource

refactor(provenance): clean up skillbook structure and insight sources

docs: restructure design docs into docs/design/, split ACE doc into three

Merge pull request #120 from kayba-ai/feat/pydantic-ai-migration

fix(deps): upgrade litellm to 1.83.0 and tau2 to dev/tau3 branch

Merge pull request #119 from kayba-ai/feat/pydantic-ai-migration

fix(types): resolve mypy errors in insight_source, runners, and rr

fix(changelog): correct logfire scrubbing description for 0.9.2

chore(release): bump version to 0.9.2 and update changelog

Merge remote-tracking branch 'origin/main' into feat/pydantic-ai-migration