[github-actions]

Automated refresh of maestro-server/src/assets/registry.json from the ACP registry CDN.

Review the diff as a supply-chain change, not a data blob. Entries here decide which
executable and arguments maestro-server spawns, so look at changed package, version,
args, cmd and archive values.

Already validated by the workflow that opened this PR:

• payload is well-formed JSON with a non-empty agents array
• cargo test -p maestro-server passes, so the file still deserializes into AcpRegistry
  and every agent resolves to a launch command

GitHub does not run workflows on pull requests opened with GITHUB_TOKEN, so the checks
above are the ones that ran. Push an empty commit if you want the normal CI run too.

Release Notes:

• N/A