Test config helper contracts

[ktsaou]

Summary

• add behavior tests for category registry helpers
• cover artifact helper ordering and child lookup
• cover retention-window and merge URL parser contracts

Validation

• go test ./pkg/config
• go test -coverprofile=/tmp/update-ipsets-config-slice28.cover -covermode=atomic ./pkg/config
• go run ./tools/archposture -root . > /tmp/update-ipsets-archposture-slice28.json
• make lint
• make staticcheck
• make golangci-lint
• CI=true make coverage
• make test-strict
• git diff --check

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 37 complexity · 0 duplication

Metric	Results
Complexity	37
Duplication	0

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AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes.}