Skip Netlify builds on main to stop metered…

Details

Production is deployed by GitHub Pages (ci.yml); Netlify exists only for
branch/PR previews, which are unmetered. Netlify production deploys cost
15 credits each, so add a [build] ignore rule that skips any build where
$BRANCH is main (ignore semantics: exit 0 = skip). Deploy previews and
branch deploys use the head branch name, so they still build; manual
"Trigger deploy" from the Netlify UI also still works.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015WJN8LQbkFiCDVEQaGemqy

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