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PRD 0012 becomes the cross-cutting overview (stuck categories taxonomy, sidecar-vs-in-container rationale, implementation chunk pointers). Implementation detail moves into four follow-on PRDs that 0012 references: 0013 (supervise plane foundation), 0014 (cred-proxy block remediation), 0015 (pipelock block remediation), 0016 (capability block remediation). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>