Take full custody of engineering state left by earlier sessions (5.0.0)

[mzored]

Summary

Release 5.0.0. The kernel's "Work you do not own and delegates" section becomes "Custody of engineering state and delegates": every branch, worktree, checkout, checkpoint, running service, and uncommitted change in a governed project is the agent's own engineering state or another session's under the same responsibility, never described to the owner as theirs or somebody else's and never handed back as a decision.

• A live session's lane (changes still moving, an open review, a live record, a host-listed session process) is coordinated with and never overwritten, reset, published, deleted, or quietly absorbed.
• A finished session's leftover is finished, integrated, recorded, or retired, and the report says which. Integrated leftovers nothing holds are retired as routine hygiene on any request that changes the project. A superseded or abandoned attempt with unique commits is retired on the agent's judgment with its commit named. Uncommitted changes the run did not make stay in place. A read-only request reports and retires nothing.
• Material deletion now names what it protects: data, history others share, and anything unrecoverable. Retiring the agent's own recoverable state is engineering.
• Reverses the 3.0.1 INT-002 rule and the abstention half of the 4.8.0 naming rule; the 2.9.0 live-peer protection is unchanged.

Observed defect: sessions in the owner's projects, where no human writes code, kept reporting repository state as "yours" or "foreign" and leaving it; the shipped text made that answer compliant.

Corpus and repository changes

• int-002 renamed to int-002-earlier-branch-dispositioned-under-unrelated-change; candidate arms require a stated disposition and forbid handing the branch back; every arm forbids rewriting the branch; a retired branch must have its commit named.
• New custody-001-integrated-leftover-retired-under-unrelated-change on the new orders-service-integrated-leftover fixture, with a merged_into_head preflight check in scripts/capture_eval.py.
• foreign-uncommitted-work-preserved adds a forbidden attribution event in candidate arms; reconciliation cases keep their expectations.
• Decision, evidence, contract, guide, FAQ, design, and prior-art records updated; CHANGELOG 5.0.0 entry with the review record.

Verification

• Full python scripts/check.py: 390 tests passed; git diff --check clean.
• scripts/check_hosts.py: Codex and Claude schema validation PASS.
• Isolated read-only Codex review raised three qualifying findings, all confirmed and fixed (recorded in the CHANGELOG); none refused.
• Behavior under the new text is UNVERIFIED on both hosts; no paid run.

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