[code-simplifier] Simplify purity_scan.go: extract resolveObj and ensureDir helpers

[github-actions]

Caution

Protected files were modified in this change.
This pull request is in request_review mode and requires explicit human scrutiny before merge.

Protected files: .github/scripts/purelock/purity_scan.go

Summary

Extractive, behavior-preserving simplification of .github/scripts/purelock/purity_scan.go, identified via the daily code-simplifier scan of files changed in the last 24 hours.

Changes

• resolveObj(pkg, ident) helper: extracted the repeated "check TypesInfo.Uses, fall back to TypesInfo.Defs" object-resolution pattern that was duplicated identically in isLocalValue, escapingTarget, and escapingWriteThroughBase.
• ensureDir(path) helper: extracted the repeated "create parent directory via filepath.Dir + os.MkdirAll" pattern duplicated in writeJSON and writeSummary.

No public interfaces, signatures, or behavior changed — these are pure DRY extractions of identical inline blocks.

Validation

• go vet ./... (in .github/scripts/purelock): passes with no findings.
• gofmt -l: no formatting issues.
• No existing unit tests for this standalone script package (go test ./... reports "no test files").
• make lint / make build for the wider Go module were not run since this script is a standalone .github/scripts/purelock module outside the main build graph; go vet/gofmt on the module itself is the applicable check.

Process notes

• Deterministic pre-processing (recent PRs/commits, file candidate list, history summary) was consumed from precomputed JSON inputs per the code-simplifier workflow's token-efficiency design; no redundant GitHub API calls were made.
• Findings were generated by a simplification-scout sub-agent pass over the file; only the two lowest-risk, purely duplicative extractions were applied (renaming/nesting suggestions were skipped as lower value / higher review overhead for this pass).

Source references: candidate file list from .github/scripts/code-simplifier/source-files.json snapshot generated 2026-08-16T03:31:01Z.

Generated by 🔧 Code Simplifier · auto · 53.1 AIC · ⌖ 6.17 AIC · ⊞ 9.4K · ◷

• expires on Aug 16, 2026, 7:37 PM UTC-08:00

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Note

This was originally intended as a pull request, but the git push operation failed.

Original error: ERR_VALIDATION: pushSignedCommits: refusing unsigned push for branch 'copilot/simplify-purity-scan-0a4a01ddfe7bca61': Signed-commit payload violates file-protection policy (request_review): .github/scripts/purelock/purity_scan.go

Workflow Run: View run details and download bundle artifact

The bundle file is available in the agent artifact in the workflow run linked above.

To create a pull request with the changes:

# Download the artifact from the workflow run
gh run download 31924328027 -n agent -D /tmp/agent-31924328027

# Fetch the bundle into a temporary ref, then update the local branch
git fetch /tmp/agent-31924328027/aw-copilot-simplify-purity-scan.bundle refs/heads/copilot/simplify-purity-scan:refs/bundles/create-pr-copilot-simplify-purity-scan-0a4a01ddfe7bca61-88836b41
git update-ref refs/heads/copilot/simplify-purity-scan-0a4a01ddfe7bca61 refs/bundles/create-pr-copilot-simplify-purity-scan-0a4a01ddfe7bca61-88836b41
git checkout copilot/simplify-purity-scan-0a4a01ddfe7bca61
# Ensure the working tree matches the updated branch
git reset --hard
# Remove the temporary bundle ref
git update-ref -d refs/bundles/create-pr-copilot-simplify-purity-scan-0a4a01ddfe7bca61-88836b41

# Push the branch to origin
git push origin copilot/simplify-purity-scan-0a4a01ddfe7bca61

# Create the pull request
gh pr create --title '[code-simplifier] Simplify purity_scan.go: extract resolveObj and ensureDir helpers' --base main --head copilot/simplify-purity-scan-0a4a01ddfe7bca61 --repo github/gh-aw