gemini-extension.json still referenced v2.9.5 and
skills/last30days-v3/SKILL.md still said 3.0.0-alpha.
Both now match pyproject.toml's canonical 3.0.0 version.
Addresses items from #190. Structural decisions (SKILL.md
consolidation, SKILL-original.md cleanup) left for maintainer.
This contribution was developed with AI assistance (Claude Code).