fix(structural): preserve decorator declaration provenance

[nia-sg-bot]

Summary

• include Python decorators in the deterministic source span and content hash for the wrapped class/function declaration
• prevent decorator-only edits from being reported as unchanged symbols
• retain Tree-sitter evidence from the first decorator line through the declaration end, with regression coverage

Validation

• python3 -m pytest -q (161 passed)
• git diff --check
• npm run compile-tests in WildestAI/wildest-vscode-ext

Compatibility

No schema, CLI option, or JSON shape changed. This corrects existing symbol change_kind and AST evidence for decorated Python declarations; the VS Code TypeScript consumer compiles against the unchanged v2 contract. Website release claims remain unchanged because this is unreleased.

Part of #22

Remaining #22 work includes additional deterministic Python baseline and fixture coverage beyond decorated-declaration provenance.

Summary by CodeRabbit

• Bug Fixes

  • Changes to function or class decorators are now correctly reflected when detecting modified declarations.
  • Structural evidence ranges now include decorators associated with functions and classes.

• Tests

  • Added coverage to verify decorator edits are identified as declaration changes.

[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: a5ca4c34-6e4b-4446-957c-1783ac407cae

📥 Commits

Reviewing files that changed from the base of the PR and between 5aece97 and 1e9d632.

📒 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

Python structural analysis now includes decorators in class and function symbol spans and hashes. Tests verify that changing a function decorator marks the function as modified and includes the decorator in AST evidence.

Changes

Decorator-aware declaration tracking

Layer / File(s)	Summary
Include decorators in declaration evidence diffgraph/structural.py, tests/test_structural.py	Decorated class and function definitions now use the wrapper range and content hash. Structural tests verify decorator changes update the function symbol and AST evidence range.

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

Merge Risk: ⚪ Minimal · up to 1e9d6

Decorator edits now correctly update declaration provenance and AST evidence. The change is covered by passing tests and compilation, with no merge-blocking risk identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 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 decorator provenance in structural analysis.
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-decorator-provenance

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