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The Deploy That Kept Failing While Everything Looked Fine: A Root-Cause Walkthrough

TL;DR A completely unrelated, already-reviewed feature branch quietly broke every deployment to production for most of a working day. Not because its own code was wrong, but because of how our platform’s config-style metadata (permission sets, layouts) gets deployed as whole files instead of diffs. The kicker: while this was happening, several other legitimate deploys succeeded and posted green checkmarks…