fix(autopublish): content-based cargo change detection (stop re-bump churn)

[thedavidmeister]

Closes #185.

The old change-detection gate hashed cargo package --list (relative paths) and compared it against tar -tzf of the published .crate (paths prefixed with name-version/, plus generated .cargo_vcs_info.json / Cargo.toml.orig). Those lists can never match, so changed=true fired on every push — re-bumping and re-publishing unchanged crates (rain-metadata-bindings churned 0.1.0 → 0.1.3 with zero source changes).

Fix

Package locally and compare normalized content against the latest published version:

• strip the name-version/ path prefix
• drop generated/volatile files (.cargo_vcs_info.json, Cargo.toml.orig, Cargo.lock)
• blank the package version = … line
• hash the sorted (path, content) stream

So the hash is identical iff the source is identical modulo version.

Verified

Locally packaged rain-metadata-bindings and the published crate produce identical normalized hashes → changed=false (would correctly skip re-publish). A real source change still flips one byte → changed=true.

Pairs with #184 (push race). Not addressed here: the npm gate (npm pack | shasum vs npm view dist.shasum) may have a similar latent issue — separate follow-up if it churns.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 1516b8f and 2357f16.

📒 Files selected for processing (1)

• .github/workflows/rainix-autopublish.yaml

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch 2026-05-26-autopublish-hash-gate

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