Instructions files people ship with: rendered into copyable modules, tracked across revisions, and reported on.
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Server components by default, one blessed data-fetching pattern, and hard rules about 'use client'. This file exists because every one of those rules was violated by an agent first.
Twelve years of Rails opinions distilled for an agent: fat models within reason, no service-object cargo cult, bin/rails test as the heartbeat, and migrations treated like the loaded weapons they are.