feat(detector): add CircleCI drift detection (v0.1.12)

[yunaremaia]

Summary

• Adds CircleCI drift detection: docker image tags vs README mentions.
• Handles variant tags ( matches ).
• Bumps version to 0.1.12.

Test plan

• 6 new unit tests covering parsing, no-drift, drift detection, and scan integration
• All 70 tests pass
• Version bumped to 0.1.12

Checks in v0.1.12

• CircleCI (docker image tags vs README)
• Terraform (versions.tf required_providers vs README)
• Maven (pom.xml vs README)
• Docker (Dockerfile FROM tag vs README)
• Java/Gradle (build.gradle sourceCompatibility/jvmTarget vs README)
• Rust (rust-toolchain.toml + Cargo.toml vs README)
• Node (package.json engines vs README)
• Python (pyproject.toml requires-python vs README)
• Go (go.mod directive vs README)
• Line endings (.gitattributes)
• Count (skills/ directory vs README)
• Actions (GitHub Actions Node 20 → Node 24)
• External resources (CDN links in delivered HTML)