Add automated package content verification

[blackopsrepl]

Closes #15.

Summary

• add a repository-owned package verification script based on cargo package --list
• fail CI and publish workflows if required packaged files are missing or excluded files leak into the crate
• expose the check locally via make package-verify and include it in the pre-release path
• document the verification workflow in the README

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Mirror package verification into Forgejo CI

Checked both CI definitions in this repo: .github/workflows/ci.yml now runs ./scripts/verify-package.sh, but .forgejo/workflows/ci.yml still stops after cargo test. If PRs or release branches are validated on the Forgejo runner, missing packaged assets or leaked excluded files will still pass there, so this automation only protects one of the maintained CI entry points.

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