fix(structural): track local import rebindings

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Summary

• track assignment, pattern, and declaration rebindings in their lexical scope
• stop emitting import-grounded call edges after a function-local imported alias is reassigned
• cover the before/after binding boundary with a structural artifact regression test

Validation

• python3 -m pytest tests/test_structural.py -q
• python3 -m pytest -q
• git diff --check

Part of #22

No schema or CLI contract changes; existing extension compatibility is preserved.

Summary by CodeRabbit

• Bug Fixes
  • Improved call relationship accuracy when imported names are rebound within a scope. Calls before a rebinding can still resolve to the import, while later calls are no longer incorrectly attributed to it.
  • Rebinding detection now handles nested function and class declarations, assignment targets, and with and except aliases more accurately. Attribute assignments and annotation-only statements no longer incorrectly invalidate imported names.

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

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• diffgraph/structural.py

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Walkthrough

The Python parser now records rebinding names, scopes, and positions. Imported call target resolution applies those rebindings by scope. Regression tests cover binding order, assignment targets, annotation-only statements, and nested declarations that shadow imported aliases.

Changes

Scoped rebinding tracking

Layer / File(s)	Summary
Collect scoped rebindings diffgraph/structural.py, tests/test_structural.py	The parser records rebindings for declarations, aliases, assignments, loop targets, and with and except targets. Assignment target collection excludes attribute and subscript expressions. Annotation-only assignments do not record rebindings. Tests cover binding order and shadowing behavior.
Apply scoped rebindings to imported call targets diffgraph/structural.py	Imported call target resolution records each rebinding under its own scope.

Priority: ⬇️ Low

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

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 9e1a7

No newly introduced issue remains identified; this change is mergeable after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 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: tracking local import rebindings in structural analysis.
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 2 files.
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: 4

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Inline comments:
In `@diffgraph/structural.py`:
- Line 637: Update the assignment-target handling that supplies bound_names to
record_rebindings so it extracts only names actually bound by the target,
excluding attribute bases and subscript expressions or indexes. Preserve
rebinding for directly assigned names and destructured targets.
- Line 637: Update the annotated-assignment handling that calls
record_rebindings so an annotation without a right-hand-side value does not
record a rebinding; preserve rebinding behavior for annotated assignments that
include a value.
- Line 466: Update the declaration handling in visit to record nested def and
class rebindings in their enclosing scope, not only top-level declarations. Pass
parents[-1][0] when parents is nonempty, otherwise retain the top-level scope;
use the function body start for function declarations and the declaration end
for classes.
- Around line 651-657: Change the record_rebindings call in the as-pattern alias
handling to use target.start_byte instead of node.start_byte, so the rebind
begins at the alias target and pre-binding calls retain import resolution.

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

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