feat(structural): analyze Python stub files

[nia-sg-bot]

Summary

• include Python type-stub (.pyi) snapshots in the deterministic Tree-sitter baseline
• retain explicit unsupported-language capability warnings for all non-Python extensions
• prove stub symbols carry the same parser provenance and schema-valid structural output as .py files

Validation

• python3 -m pytest (208 passed)
• git diff --check

Part of #22

Remaining work

The broader Tree-sitter baseline still tracks the issue's remaining language, fixture, and capability-boundary acceptance criteria.

Summary by CodeRabbit

• New Features
  • Python stub files (.pyi) are now analyzed alongside Python source files.
• Bug Fixes
  • Unsupported-language warnings now accurately list both supported Python file extensions.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 3ed61d90-e65e-4f42-9bed-acac0fdb42a8

📥 Commits

Reviewing files that changed from the base of the PR and between c499548 and 8ae763e.

📒 Files selected for processing (2)

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

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Walkthrough

Structural analysis now treats .pyi files as Python alongside .py files. Tests verify stub-file analysis, modified-symbol reporting, Tree-sitter provenance, and updated unsupported-language warning text.

Changes

Python Stub File Support

Layer / File(s)	Summary
Stub classification and analysis diffgraph/structural.py, tests/test_structural.py	Python stub files are classified as Python. Unsupported-language warnings list .py and .pyi as supported extensions. Tests verify that a changed stub file reports a modified symbol and Tree-sitter provenance without warnings.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 8ae76

Stub files now use the existing Python structural-analysis path, while unsupported extensions retain warnings. The change appears ready to merge.

🚥 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: adding analysis support for Python stub files.
Docstring Coverage	✅ Passed	Docstring coverage is 83.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 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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