ci: weekly scheduled benchmark baseline on main

[aarontrowbridge]

Closes #146.

One trigger block: Mondays 03:30 UTC schedule: on benchmark.yml, so the published gh-pages series (the baseline PR benchmark reports diff against) never ages past a week. No benchmark definitions, thresholds, or alert behavior touched. Style matches nightly.yml's schedule block.

Context: during #145 review, the benchmark report diffed against an Aug 21 baseline — six days of main + registry drift masquerading as iteration-count regressions. This keeps the anchor fresh.

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'DirectTrajOpt.jl benchmarks'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.20.

Benchmark suite	Current: 66ecc8c	Previous: 110708d	Ratio
scaling_N101_d16_ipopt [wall]	53.411757564 s	7.520233163 s	7.10
scaling_N101_d16_ipopt [alloc]	226877621656 bytes	31020145144 bytes	7.31
scaling_N101_d16_ipopt [iters]	50 iterations	6 iterations	8.33
scaling_N101_d4_ipopt [wall]	2.177957766 s	0.534550853 s	4.07
scaling_N101_d4_ipopt [alloc]	6955784256 bytes	1722050512 bytes	4.04
scaling_N101_d4_ipopt [iters]	50 iterations	11 iterations	4.55
scaling_N25_d8_ipopt [wall]	0.213802688 s	0.007596808 s	28.14
scaling_N25_d8_ipopt [alloc]	799125832 bytes	22601216 bytes	35.36
scaling_N25_d8_ipopt [iters]	4 iterations	0 iterations	+∞
scaling_N51_d16_ipopt [wall]	1.681779282 s	1.104382817 s	1.52
scaling_N51_d16_ipopt [alloc]	6625417688 bytes	4518562000 bytes	1.47
scaling_N51_d16_ipopt [iters]	2 iterations	1 iterations	2
scaling_N51_d8_ipopt [wall]	3.875057712 s	2.296990438 s	1.69
scaling_N51_d8_ipopt [alloc]	15592198256 bytes	9284381976 bytes	1.68
scaling_N51_d8_ipopt [iters]	50 iterations	28 iterations	1.79

This comment was automatically generated by workflow using github-action-benchmark.

[codecov]

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