docs: record v0.2.0 release proof

[VrtxOmega]

Summary

• update the README current release to the verified npm and GitHub v0.2.0 release
• record the exact published npm gitHead in the launch runbook
• replace the context-sensitive npx MCP smoke command with the verified npm exec form

Verification

• npm registry reports latest as 0.2.0 with gitHead 8739108af4055c9ac72b033a7da4df770aa43272
• GitHub release v0.2.0 exists and its tag resolves to the same commit
• npm run repo:verify
• node --test test/github-action.test.mjs test/repo-hygiene.test.mjs (6/6)
• README rendered cleanly through GitHub's GFM API

Scope

Documentation only: two files, with no source, package, or workflow changes.