Replace black with ruff formatter in pre-commit

[Copilot]

Replaces the Black formatter with Ruff's built-in formatter (ruff-format) in the pre-commit configuration. Ruff format is a drop-in Black replacement with better performance.

Changes

• .pre-commit-config.yaml: Removed black-pre-commit-mirror repo, added ruff-format hook to existing ruff-pre-commit repo
• light-curve/pyproject.toml: Removed black from dev dependencies
• Code formatting: Ruff formatter applied minor style improvements to 2 files (added parentheses for operator precedence clarity, removed extra blank line)

Ruff format uses its default configuration which is fully compatible with Black's behavior.

<issue_title>pre-commit: replace black with ruff formatter </issue_title>
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> ## Comments on the Issue (you are @copilot in this section)
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• Fixes pre-commit: replace black with ruff formatter  #350

Original prompt

---

This section details on the original issue you should resolve

<issue_title>pre-commit: replace black with ruff formatter </issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes pre-commit: replace black with ruff formatter  #350

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[codspeed-hq]

CodSpeed Performance Report

Merging #576 will degrade performances by 36.52%

_{Comparing copilot/replace-black-with-ruff-formatter (86853a3) with master (3ef2535)¹}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

⚡ 51 improvements
❌ 12 regressions
✅ 43 untouched
⏩ 106 skipped²

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Mode	Benchmark	BASE	HEAD	Change
⚡	WallTime	test_benchmark_naive	2.3 ms	2 ms	+14.3%
❌	WallTime	test_benchmark_rust	61.4 µs	68.8 µs	-10.77%
⚡	WallTime	test_benchmark_lc_py	3.9 ms	3.3 ms	+16.63%
⚡	WallTime	test_benchmark_cesium	3.6 ms	3.3 ms	+11.04%
❌	WallTime	test_benchmark_rust	2 µs	3.1 µs	-36.52%
⚡	WallTime	test_benchmark_lc_py	446.6 µs	359.5 µs	+24.22%
⚡	WallTime	test_benchmark_naive	430 µs	345.2 µs	+24.58%
⚡	WallTime	test_benchmark_naive	2.1 ms	1.6 ms	+29.9%
⚡	WallTime	test_benchmark_naive	2.1 ms	1.6 ms	+28.86%
⚡	WallTime	test_benchmark_lc_py	3.9 ms	3.4 ms	+16.25%
⚡	WallTime	test_benchmark_cesium	3.8 ms	3.4 ms	+10.86%
⚡	WallTime	test_benchmark_lc_py	34.8 µs	29.7 µs	+17.32%
❌	WallTime	test_benchmark_rust	2.3 µs	2.6 µs	-12%
⚡	WallTime	test_benchmark_lc_py	47.6 µs	40 µs	+19.12%
❌	WallTime	test_benchmark_rust	3.6 µs	4.8 µs	-24.05%
⚡	WallTime	test_benchmark_lc_py	29.9 µs	24.9 µs	+20.27%
⚡	WallTime	test_benchmark_naive	19.8 µs	17.8 µs	+11.21%
❌	WallTime	test_benchmark_rust	3.1 µs	3.4 µs	-10.28%
⚡	WallTime	test_benchmark_lc_py	34.2 µs	28.3 µs	+20.64%
⚡	WallTime	test_benchmark_naive	23.7 µs	21.3 µs	+11.06%
...	...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

Footnotes

1. No successful run was found on master (86853a3) during the generation of this report, so 3ef2535 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

2. 106 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.60%. Comparing base (3ef2535) to head (86853a3).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #576   +/-   ##
=======================================
  Coverage   82.60%   82.60%           
=======================================
  Files           9        9           
  Lines        2604     2604           
=======================================
  Hits         2151     2151           
  Misses        453      453           

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