feat(structural): preserve relative import evidence

[nia-sg-bot]

Summary

• preserve Python relative from imports (for example from ..pkg import value) in the deterministic structural artifact
• retain exact relative-module provenance as an explicit unresolved/external import target
• preserve alias bindings so calls resolve through deterministic import_grounded edges

Validation

• python3 -m pytest (171 passed)
• git diff --check

Part of #22

Remaining issue work includes broader Tree-sitter baseline capability and fixture coverage tracked by the parent.

Summary by CodeRabbit

• Bug Fixes

  • Relative Python imports now preserve their leading dots and exact module paths.
  • Import relationships and call tracking for relative imports are now resolved consistently.

• Tests

  • Added coverage confirming correct handling of relative imports, unresolved module references, and calls through aliased imports.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: f622fd30-599f-4ab2-8f56-ede8edb5d546

📥 Commits

Reviewing files that changed from the base of the PR and between 7f1e4f4 and ecfa2e6.

📒 Files selected for processing (2)

• diffgraph/structural.py
• tests/test_structural.py

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

The parser now preserves leading dots in relative from imports. A new test verifies the import symbol, external-module edge, and grounded call edge for a relative import.

Changes

Relative import parsing

Layer / File(s)	Summary
Preserve relative module evidence diffgraph/structural.py, tests/test_structural.py	The parser uses the first relative_import child when module_name is absent. The test verifies ..pkg, its external-module edge, and the import_grounded call edge from caller to run_local.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to ecfa2

Relative imports retain their package provenance in the structural artifact, with coverage for the emitted import and grounded call bindings. The change is ready to merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving evidence from relative imports in the structural artifact.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch nia/issue-22-relative-imports

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[nia-sg-bot]

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