feat(rules): Add pipeline drift rules

[machado144]

Summary

• add typed CI violations plus JSON, SARIF, and GitHub annotation output
• add placement rules, required groups, baselines, changed-only mode, and strict config decoding
• add multi-language boundary checks for Go, JavaScript/TypeScript, and Python imports
• update user and AI docs with cross-linked configuration and CI guidance

Tests

• go test ./...
• ./bin/structlint validate --config .structlint.yaml --json-output /tmp/structlint-self.json --silent
• dupehound scan --dead-code --top 20 (reports pre-existing fixture duplication/dead-code heuristics; no blocking compile/test failures)

[github-actions]

⚠️ Invalid PR Title

PR title must follow the Conventional Commits format since we use squash merge:

<type>[optional scope][!]: <description>

Allowed types: feat, fix, docs, style, refactor, test, chore, build, ci, perf, revert

Examples:

• feat: add new feature
• fix(api): resolve null pointer
• feat!: breaking change
• chore(deps): update dependencies

[github-actions]

StructLint — All checks passed

78 rules validated against .structlint.yaml. No violations found.

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