fix(structural): respect with and except bindings

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Summary

• prevent with … as name and except … as name bindings from being mistaken for imported call targets
• preserve the conservative deterministic topology contract by omitting those ambiguous call edges
• cover both Python as-binding forms with schema-valid artifact tests

Part of #22

Validation

• python3 -m pytest (180 passed)
• git diff --check

Remaining work

Issue #22 remains open for additional deterministic Tree-sitter baseline capability work and golden coverage.

Summary by CodeRabbit

• Bug Fixes
  • Corrected call relationship analysis for Python code using with ... as and except ... as bindings.
  • Prevented imported aliases from being incorrectly associated with calls when those names are locally reassigned.

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📒 Files selected for processing (2)

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

🚧 Files skipped from review as they are similar to previous changes (1)

• tests/test_structural.py

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Walkthrough

The parser now identifies names bound by with ... as and except ... as. Module-scope bindings replace earlier imports for later call resolution. Tests cover local, module, attribute, and destructured targets.

Changes

Binding Shadowing Correction

Layer / File(s)	Summary
Register with and except aliases diffgraph/structural.py, tests/test_structural.py	The traversal collects identifier targets from as_pattern nodes, records module-scope rebindings, and excludes attribute and subscript object references. Tests verify local and module shadowing, attribute targets, and destructured aliases.

Priority: ⬇️ Low

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

Change: Bug fix

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 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: fixing structural analysis for Python with and except bindings.
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.

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Actionable comments posted: 2

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Inline comments:
In `@diffgraph/structural.py`:
- Line 484: Update the binding handling around identifiers(target) so top-level
as-bound names are also appended to module_rebindings with their source line,
while preserving the existing bindings update for all scopes. Add a regression
case covering a module-scope with or except as binding that rebinds an imported
call target.
- Line 484: Update the binding extraction around identifiers(target) so only
names actually assigned by an as-target are recorded, including direct names and
destructuring targets while excluding attribute and subscript bases. Preserve
the existing bindings.setdefault(scope, set()).update(...) flow and use the
target-aware extraction in its place.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 3ccac38b-f4f1-4054-859f-b20af15688aa

📥 Commits

Reviewing files that changed from the base of the PR and between ef827a1 and 39e0b6e.

📒 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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