Add AGENTS.md and some basic skills

[gatesn]

The skills are cribbed from the Velox repository and updated for Vortex.

Also permits renovate bot to self-approve PRs.

[codspeed-hq]

Merging this PR will improve performance by 20.23%

⚡ 9 improved benchmarks
✅ 1154 untouched benchmarks
⏩ 1457 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	take_map[(0.1, 0.5)]	1,154.5 µs	985.6 µs	+17.14%
⚡	Simulation	take_map[(0.1, 1.0)]	2 ms	1.6 ms	+20.23%
⚡	Simulation	patched_take_10k_dispersed	316 µs	285.8 µs	+10.58%
⚡	Simulation	patched_take_10k_contiguous_patches	258.1 µs	227.7 µs	+13.32%
⚡	Simulation	patched_take_10k_random	270.3 µs	240 µs	+12.65%
⚡	Simulation	patched_take_10k_contiguous_not_patches	258.4 µs	228.1 µs	+13.29%
⚡	Simulation	take_10k_dispersed	284.4 µs	239.5 µs	+18.76%
⚡	Simulation	take_10k_first_chunk_only	270.6 µs	225.7 µs	+19.91%
⚡	Simulation	patched_take_10k_first_chunk_only	302 µs	271.7 µs	+11.15%

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_{Comparing ngates/update-skills (43ba6ab) with develop (01679cd)}

Footnotes

1. 1457 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. ↩