docs(specs): shepherd durable patterns — checkpoints + rainbow shifts (OPS-482)#16
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… (OPS-482) Fills the blueprint gap the 2026-07-07 deep-research pass left open: Anthropic's resume-from-error + rainbow-deployment discipline is verified 3-0 but prescribes no engine or checkpoint format. Designs shepherd's turn-boundary checkpoint model, version-fingerprinted rainbow shifting, the Engram run-state/semantic-state boundary, and concrete Temporal escalation criteria — evidence-anchored to the deep-research and gap-closure eval docs and to shepherd's actual claude-only executor constraints.
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Summary
Test plan
.vcscore//retained-changeset/claude-executor model as described inpackages/shepherd/README.mdand the adoption evalinstall.sh's--forcepin-bump behavior