fix: run baseline bench comparison on main pushes

[RostiMelk]

Main branch summaries were missing the comparison table and feature breakdown that PR comments get. Now both events run a baseline benchmark and produce the full report. Removes unused benchmark-report.md generation.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
react-logo-soup	Ready	Preview, Comment	Feb 7, 2026 4:01pm

[github-actions]

Benchmark Comparison: main vs fix/bench-summary-features

Threshold: 5%+ change, >100us absolute delta, and statistically significant (p<0.05).

Benchmark	main	fix/bench-summary-features	Change	p-value	Verdict
content detection (1 logo)	35.50 us	33.78 us	-4.8%	0.399	unchanged
render pass (20 logos)	862 ns	833 ns	-3.3%	0.214	unchanged
mount 20 logos (no detection)	4.85 us	3.04 us	-37.3%	<0.001 ***	unchanged
mount 20 logos (defaults)	842.91 us	811.25 us	-3.8%	0.002 **	unchanged

No regressions detected.

Feature cost breakdown

How expensive are individual features? Measured on this run's HEAD commit.

Feature	On	Off	Cost	Sig
densityAware: true vs false	33.28 us	31.64 us	~same	0.181
alignBy: visual-center-y vs bounds	789 ns	57 ns	14× slower	<0.001 ***
cropToContent: true vs false	2.13 ms	41 ns	2.13 ms	<0.001 ***
layout update: full mount vs cached	836.80 us	1.89 us	442× slower	<0.001 ***

Full benchmark output in the CI job logs.