feat: ship wax mcp reliability and coordination updates (#57)

Merge release/0.1.19 into main

release: cut 0.1.19

Add Discord community badge to READMEs

docs: humanize README copy

docs: refresh Claude Code Wax setup prompt

Merge pull request #55 from christopherkarani/fix/issue-53-structured-metadata

fix: surface stored metadata in recall results

Merge pull request #54 from christopherkarani/performance

fix: release waxmcp workflow matrix key

release: bump waxmcp to 0.1.18

fix: use sandbox-safe path in quickstart demos (closes #34)

feat: add Snowflake Arctic Embed Small as opt-in embedding provider

fix: move CoreML prediction off cooperative thread pool to prevent MCP stall

fix: prevent MCP stall on vector-search remember