docs: prepare v0.1.0 consumer release

[whitemoonriver]

Summary

Prepare the existing v0.1.0 candidate for first public consumption without adding runtime features.

• Document project-local installation with npm install --save-dev pg-runtime-verifier.
• Document packaged CLI invocation through npx and npm exec after installation.
• State the Node.js 20+ and PostgreSQL 16/17/18 support boundary and current safety/non-goals.
• Prepare the 0.1.0 changelog section without creating a release.
• Extend package smoke coverage so the documented install and invocation paths are exercised from the packed tarball in a clean consumer project.

Validation

Branch CI run #50 passed the full Node 20/22 Linux/Windows matrix, PostgreSQL 16/17/18 integrations, and package smoke. The packed consumer install, npx ... --help, and npm exec ... --version paths all succeeded.

Release scope

No package version change, git tag, GitHub Release, npm publish, or runtime feature change is included.

Privacy isolation

The changes contain only public package documentation, release notes, and generic package validation. No local user paths, credentials, production data, personal identifiers, or private-source material are included.