svatantrya 08394f4868 lint: ruff cleanup pass across bal/ and tests/ ...

- Sort imports and fix pyproject ruff config (per-file ignores for
  intentional Qt/core exceptions)
- Mark Heirs.validate_* helpers as @staticmethod
- Clean up dead code, rename shadowing vars, use raise ... from
- Add AGENTS.md with env/lint/test/release guidance

2026-07-31 16:03:17 -04:00

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