feat: expand lockfile resolver coverage across additional ecosystems

[DevonL]

📄 Summary

PR 2 of 6 — Dependency Health V2

Adds lockfile parsers for Cargo, Composer, Dart, Docker, Go, Gradle, Helm, Hex, NuGet, Ruby, and Swift. Includes the lockfile resolver registry and test fixtures.

Base: PR #41 (lockfile core)

🔍 Related Issues

Link to any related GitHub issues (e.g., Fixes #12, Closes #34):

🧪 Type of Change

Please check the relevant type tag for this PR title:

• [FIX] Bug fix
• [NEW] New thing
• [REFACTOR] Internal changes such as code restructuring or optimization that does not alter functionality
• [DOC] Documentation-only changes
• [CHORE] Maintenance, cleanup, or CI configuration

🧪 How Has This Been Tested?

Describe how you tested your changes. Include CI runs, local tests, manual verification, or screenshots if applicable.
The entirety of the Dependency Health updates were tested with a combination of automated testing, and manual testing against each of the upstream ecosystems.

📸 Screenshots (if applicable)

If UI or logs are affected, include before/after screenshots or output.

✅ Checklist

• I’ve read and followed the CONTRIBUTING.md.
• I’ve added or updated documentation as needed.
• I’ve verified the change is tested and works as intended.
• CI/CD checks pass and do not break existing functionality.
• My code follows the style guidelines of this project.

[DevonL]

Closing this PR because the initial split/stacking strategy was incorrect and produced oversized, overlapping diffs.

A clean stacked PR set will be reopened from the original feature branch.