Record completed handoff cleanup

[snapsynapse]

Summary

• record that completed private rotation packets, source assets, session notes, and the retired position sweep were removed
• record that the stale untracked 2026-07-07 code review was removed after triage
• preserve its four still-relevant findings in the tracked audit and private roadmap

Retained private handoffs

• the pre-commit scrub control
• the protocol-resistant mechanisms design input
• the preliminary skills inventory
• the private handoff index

Verification

• follow-up diff against merged PR Add parallel write conflict preflight #1 contains only NEXT.md and the tracked handoff audit
• python3 -m harness.cli eval evals/stewardship.yaml: 2/2 passed
• git diff --check: clean
• private-name staged-diff scrub: zero matches