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Fixes #68. Two-file follow-up to the 1.0 website release.

• Replace hard-coded machine checkout paths with this repository's README and its release/migration/npm/Bun entries.
• Resolve manifest paths against the checker root and fail on external paths instead of silently skipping them.
• Keep the existing drift workflow; no new dependency or cross-repository machinery.

Verification: normal README check passes without skips. Isolated actual-checker regression cases reject a missing Bun command and a parent-directory escape. Diff check passes; current tracked-text scan found no remaining user-home paths. Website HTML/assets are unchanged from the reviewed and live-tested #66 release.

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Reviewed 9cf4570: exactly the manifest and README checker change; public HTML/assets are unchanged. Current-head drift and site checks pass. Actual checker regression cases pass for repository-relative success, missing release command failure and external-path rejection. No external entries are skipped. Proceeding with the requested merge using the existing per-PR admin path; branch protections remain unchanged.