fix: include feature breakdown in main branch bench summary

[RostiMelk]

Feature cost breakdown was only shown in PR summaries. Now it's appended for main branch runs too, and deduplicated out of the if/elif branches.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
react-logo-soup	Ready	Preview, Comment	Feb 7, 2026 3:49pm

[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)	33.43 us	31.29 us	-6.4%	0.072	unchanged
render pass (20 logos)	1.12 us	1.11 us	-0.9%	0.789	unchanged
mount 20 logos (no detection)	3.28 us	3.03 us	-7.6%	0.317	unchanged
mount 20 logos (defaults)	793.21 us	800.08 us	+0.9%	0.395	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	30.89 us	31.38 us	~same	0.534
alignBy: visual-center-y vs bounds	878 ns	54 ns	16× slower	<0.001 ***
cropToContent: true vs false	2.04 ms	41 ns	2.04 ms	<0.001 ***
layout update: full mount vs cached	792.44 us	1.75 us	452× slower	<0.001 ***

Full benchmark output in the CI job logs.