The repository state has moved well past the oldest migration drafts: backend public payloads are already contract-first in several paths, research provenance now spans runner/live/full-state logs, and the offline trace/A-B toolchain is part of the normal maintainer workflow. This doc update records what is already true on mainline versus what remains target-state, so future changes stop treating stale design notes as the current architecture.\n\nConstraint: Reflect only behavior that is already present on mainline; avoid documenting unrecovered worker-only experiments as current reality\nRejected: Collapse everything into README | maintainer-facing migration/provenance details would become harder to keep precise and reviewable\nConfidence: high\nScope-risk: narrow\nDirective: When changing backend public fields or profiling semantics, update AGENTS.md and the linked docs in the same change set so maintainer guidance does not drift behind code again\nTested: git diff --check on updated documentation set\nNot-tested: No runtime/code-path changes in this docs-only commit
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