P2: Align npm package contents with README ECR script instructions

[vamgan]

Problem

The worker README instructs users to run ./scripts/build-and-push-ecr.sh, but package.json excludes scripts/ from published package files.

Relevant files:

• package.json files
• README.md ECR section

Impact

Users reading the npm package README see instructions for a script that is not shipped.

Suggested fix

Either include scripts/ in package files, or clarify that the script is repository-only and provide npm-compatible ECR build/push instructions.

Acceptance criteria

• README instructions work from the published package, or clearly state when repository checkout is required.