v0.4.0

What's Changed

• feat(shared): consolidate cross-cutting Python utilities into shared library by @paulnsorensen in #67
• ci(security): add CodeQL workflow for python and actions by @paulnsorensen in #68
• feat(skills): per-finding severity rubric for /age by @paulnsorensen in #66
• docs(skills): add optional Serena MCP guidance to cheez-* skills by @paulnsorensen in #65
• feat(skills/mold): add curd-count script for decomposability-driven handoff by @paulnsorensen in #69
• chore(build): add skills-ref + ruff to justfile and sync CI by @paulnsorensen in #72
• refactor(scripts): succinctness pass across 14 scripts (−341 LOC) by @paulnsorensen in #71

Full Changelog: v0.3.1...v0.4.0