docs: add pre-commit exclude pattern guidance for large/generated dirs

[endavis]

Description

Add commented-out exclude: pattern examples to .pre-commit-config.yaml for the check-added-large-files and detect-private-key hooks. This gives contributors ready-made templates they can uncomment and adapt when projects have large data directories or non-secret key-like files that trigger false positives.

Related Issue

Addresses #294

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test improvement

Changes Made

• Added commented-out exclude: example after check-added-large-files hook for large data/generated directories
• Added commented-out exclude: example after detect-private-key hook for directories with non-secret key-like patterns

Testing

• All existing tests pass
• Added new tests for new functionality
• Manually tested the changes

Checklist

• My code follows the code style of this project (ran doit format)
• I have run linting checks (doit lint)
• I have run type checking (doit type_check)
• I have added tests that prove my fix is effective or that my feature works
• All new and existing tests pass (doit test)
• I have updated the documentation accordingly
• I have updated the CHANGELOG.md
• My changes generate no new warnings

Additional Notes

Comment-only change to .pre-commit-config.yaml. No functional behavior is altered. No tests are needed since no code is added or modified.

[github-actions]

Benchmark

Details

Benchmark suite	Current: 631218d	Previous: dbc9884	Ratio
tests/benchmarks/test_bench_core.py::test_bench_greet_default	8836578.096736405 iter/sec (stddev: 8.890156692270802e-9)	8728938.237929476 iter/sec (stddev: 2.6147850131389897e-8)	0.99
tests/benchmarks/test_bench_core.py::test_bench_greet_with_name	8998538.755694509 iter/sec (stddev: 1.0625865326875989e-8)	8824487.488376206 iter/sec (stddev: 1.0764640102900196e-8)	0.98
tests/benchmarks/test_bench_core.py::test_bench_greet_long_name	5682740.12839345 iter/sec (stddev: 1.2707061353185103e-8)	5218797.625415371 iter/sec (stddev: 2.8228318211772188e-8)	0.92
tests/benchmarks/test_bench_logging.py::test_bench_get_logger	1836906.4896003555 iter/sec (stddev: 1.706351144619163e-7)	1632351.7689504097 iter/sec (stddev: 2.5443274722814504e-7)	0.89
tests/benchmarks/test_bench_logging.py::test_bench_setup_logging	529260.6212701318 iter/sec (stddev: 3.0782813289872925e-7)	493165.5322141699 iter/sec (stddev: 5.251655780708425e-7)	0.93

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