ci: add cargo-audit dependency scan (Bundle C)

[Liohtml]

Overview

Bundle C — adds a dependency vulnerability scan to CI (#28).

A new audit job installs cargo-audit and runs cargo audit against the resolved dependency tree, so a known RUSTSEC advisory in chromiumoxide, tokio, regex, etc. surfaces on every push/PR instead of silently landing.

Details

• Because Cargo.lock is gitignored (library crate), the job runs cargo generate-lockfile first so it audits the exact resolved versions.
• Actions are SHA-pinned to match the existing test / lint jobs (least-privilege permissions, persist-credentials: false).
• Verified locally: cargo audit reports no advisories in the current tree (150 deps scanned), so the job is green on day one.

Test plan

• cargo generate-lockfile + cargo audit run locally → clean (exit 0)
• YAML validated; actions reuse the already-verified pinned SHAs
• Job runs green in CI on this PR

Closes #28

https://claude.ai/code/session_01TPpTHPokxsZ3dQpRzg4NkD

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: e0c20953-7ebc-48b4-b3ff-c7d9d17d5039

📥 Commits

Reviewing files that changed from the base of the PR and between 3bdd0a1 and 8430cfb.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• CHANGELOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/bundle-c-ci-audit

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