release: stylegallery 0.1.18 - #79

Release stylegallery@0.1.18: audit real-site fixes (#76), taste-skill evidence grades and guidance (#77), and taste-skill machine rules (#78).

• package.json version 0.1.18 and a log.md entry
• Regenerated search embeddings (log.md is embedded), the material registry, and the A2A/AG-UI lifecycle caller inventories (generateProtocolExtensionInventory) for the version change
• Local: validate, validate:lifecycle-dispositions, validate:material, test:material, test:lifecycle-dispositions, and generate-search-embeddings --check all pass

consumer_reference: not_applicable - release metadata selects no consumer reference record.