fix: handle annotated assignments (AnnAssign) in migration files

[stephen-kintsugi]

Summary

• Handle ast.AnnAssign nodes alongside ast.Assign in extract_revision_info so migrations using revision: str = '...' (newer Alembic default) are parsed correctly
• Add test coverage for annotated standard, first, and merge migrations

Fixes #4

Tests

35/35 passing, including 3 new tests for annotated assignment parsing.

Summary by CodeRabbit

• Chores

  • Bumped version to 0.3.2

• New Features

  • Added support for annotated assignments in Alembic migration file processing, enabling compatibility with modern Python syntax conventions

• Tests

  • Added comprehensive test coverage for annotated migration metadata handling across multiple migration scenarios

[coderabbitai]

Caution

Review failed

The pull request is closed.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2ff2940 and e80ff29.

📒 Files selected for processing (4)

• pyproject.toml
• squawk_alembic/__init__.py
• squawk_alembic/hook.py
• tests/test_revision_info.py

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Walkthrough

This PR adds support for parsing annotated assignments (PEP 526 type annotations) in Alembic migration files, allowing the hook to handle both revision = '...' and revision: str = '...' syntax. Version bumped to 0.3.2 with comprehensive test coverage for the new functionality.

Changes

Cohort / File(s)	Summary
Version Updates pyproject.toml, squawk_alembic/__init__.py	Patch version bump from 0.3.1 to 0.3.2.
AST Parsing Enhancement squawk_alembic/hook.py	Added support for ast.AnnAssign nodes alongside ast.Assign in extract_revision_info to handle annotated revision variable declarations. Validates target is a Name and value exists for AnnAssign; existing Assign logic preserved.
Test Coverage tests/test_revision_info.py	Added three new tests validating annotated assignment handling: standard annotated revision with Union typing, first migration with None down_revision, and merge revision scenarios.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bug/4-support-annassign

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