ci: add pre-commit config with ruff linting and formatting

[TimeToBuildBob]

Summary

• Add .pre-commit-config.yaml with ruff (lint + format) hooks matching the existing CI lint checks
• Auto-format 3 files that had minor formatting inconsistencies (aw_core/util.py, tests/test_query2.py, tests/utils.py)
• Include standard file checks: trailing whitespace, end-of-file fixer, TOML/YAML validation, merge conflict detection

This lets developers catch lint and formatting issues locally before pushing, saving CI round-trips.

Setup

pip install pre-commit  # or: pipx install pre-commit
pre-commit install

Then ruff lint + format runs automatically on each commit.

Test plan

• Verified ruff check . passes on current master
• Applied ruff format to fix 3 files with minor formatting differences
• All pre-commit hooks pass after formatting

---

Important

Adds pre-commit configuration with ruff for linting and formatting, and auto-formats three files for consistency.

• Pre-commit Configuration:
  • Adds .pre-commit-config.yaml with ruff hooks for linting and formatting.
  • Includes hooks for trailing whitespace, end-of-file fixer, TOML/YAML validation, and merge conflict detection.
• Code Formatting:
  • Auto-formats aw_core/util.py, tests/test_query2.py, and tests/utils.py for minor inconsistencies.
• Setup Instructions:
  • Provides setup instructions for installing and using pre-commit with ruff.
• Testing:
  • Verified ruff check . passes on current master.
  • Applied ruff format to fix formatting in 3 files.
  • All pre-commit hooks pass after formatting.

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[ellipsis-dev]

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[greptile-apps]

Greptile Summary

This PR adds pre-commit configuration to enable local linting and formatting checks before commits, reducing CI round-trips. The setup properly integrates with the existing ruff configuration in pyproject.toml and mirrors the CI lint workflow.

• Pre-commit hooks configured for ruff linting (with auto-fix) and formatting
• Standard file validation hooks included (trailing whitespace, end-of-file, TOML/YAML validation, merge conflict detection)
• Three files auto-formatted with minor style improvements (condensed empty class, removed unnecessary line breaks, corrected operator spacing)
• All formatting changes are cosmetic and maintain code functionality

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The PR adds development tooling without modifying any runtime logic, and all auto-formatting changes are minor cosmetic improvements that don't affect functionality
• No files require special attention

Important Files Changed

Filename	Overview
.pre-commit-config.yaml	Added pre-commit configuration with ruff linting and formatting hooks, plus standard file validation checks
aw_core/util.py	Auto-formatted empty exception class to single line per ruff style
tests/test_query2.py	Auto-formatted to remove unnecessary line breaks in format calls and raw string assignments
tests/utils.py	Auto-formatted exponentiation operator to remove spaces per PEP 8 style

_{Last reviewed commit: 3def291}

[greptile-apps]

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