fix: resolve golangci-lint issues across VDG and CFG packages (PR-02)

[shivasurya]

Part 2/8 of V5 QueryType × VDG Integration. Fix lint issues across VDG and CFG packages post-merge.

[shivasurya]

• test(dsl): edge case, V4 regression, and QueryType 10-file chain tests (PR-08) #599
• test(dsl): type_constrained_call + VDG integration tests (PR-07) #598
• refactor: remove dead string-only matching functions (PR-06) #597
• feat(dsl): inter-procedural VDG global analysis with summary confirmation (PR-05) #596
• feat(dsl): 3-tier VDG local analysis replacing line-proximity (PR-04) #595
• feat(dsl): initialize executor defaults and bridge layer tests (PR-03) #594
• fix: resolve golangci-lint issues across VDG and CFG packages (PR-02) #601 👈 (View in Graphite)
• feat: VDG core + CFG + inter-procedural taint analysis (PR-01) #600
• main

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[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

_{This report is generated by SafeDep Github App}

[shivasurya]

Merge activity

• Mar 12, 4:25 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Mar 12, 4:27 AM UTC: Graphite rebased this pull request as part of a merge.
• Mar 12, 4:28 AM UTC: @shivasurya merged this pull request with Graphite.

[github-actions]

Code Pathfinder Security Scan

No security issues detected.

Metric	Value
Files Scanned	4
Rules	38

---

_{Powered by Code Pathfinder}

[codecov]

Codecov Report

❌ Patch coverage is 56.52174% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.85%. Comparing base (12839a4) to head (fde2161).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sast-engine/graph/callgraph/cfg/builder.go	60.00%	8 Missing ⚠️
sast-engine/dsl/dataflow_executor.go	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #601      +/-   ##
==========================================
- Coverage   83.86%   83.85%   -0.01%     
==========================================
  Files         155      155              
  Lines       20877    20877              
==========================================
- Hits        17509    17507       -2     
- Misses       2728     2729       +1     
- Partials      640      641       +1     

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