chore: re-sync Cargo.toml with crates.io + use PUBLISH_PRIVATE_KEY

[thedavidmeister]

Summary

`rain-math-float 0.1.1-alpha.2` was published to crates.io by the Cargo Crate Release workflow after #208 landed, but the post-publish push of the version-bump commit was rejected by branch protection:

remote: error: GH013: Repository rule violations found for refs/heads/main.
! [remote rejected] main -> main (push declined due to repository rule violations)

The npm release workflow uses `PUBLISH_PRIVATE_KEY` (the deploy key configured with bypass). My workflow used `PUBLISHER_SSH_KEY` (copied from rain.wasm) which doesn't have bypass on this repo.

• Swap `PUBLISHER_SSH_KEY` → `PUBLISH_PRIVATE_KEY` in cargo-publish.yaml.
• Bump `crates/float/Cargo.toml` to `0.1.1-alpha.2` to re-sync main with crates.io.

Test plan

• After merge, the cargo-publish workflow's hash-skip should not re-publish (Cargo.toml content matches the latest published metadata).
• Next meaningful change triggers `0.1.1-alpha.3` and the version-bump commit lands cleanly via the bypass key.

Generated with Claude Code.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 732f1a2e-e94a-48dd-b76f-5818eb715641

📥 Commits

Reviewing files that changed from the base of the PR and between 6368545 and 6671d58.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• .github/workflows/cargo-publish.yaml
• crates/float/Cargo.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-12-fix-float-version-drift-2

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