v1.2.5

Docs & metadata release — no runtime, compiler, or catalog changes.

• README: disambiguation-led intro + "Not to be confused with" callout, v1.2.5 status table, public-repo truth pass
• npm: new package description + expanded keywords; repo-root llms.txt added
• MCP Registry: server.json now advertises the keyless Streamable HTTP remote https://api.motionspec.dev/mcp; GitHub Action auto-publishes the registry entry on tag push

Tests: 295 passing. npm: https://www.npmjs.com/package/motionspec