Docs and metadata only: runtime-neutral README hero (the npm page), npm
description and first keywords, README.intro.md drops "Cursor-only".

Version references bumped to 0.7.6 (package.json, CONSUMERS.md, README,
embed-api, site, llms.txt and its test).

Verified: pnpm install --frozen-lockfile, pnpm typecheck, pnpm test (1135
vitest + 3 node suites), pnpm build — the publish.yml gates.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>