Brief A wrapu

[gunbai-bot]

Auto-opened by session-dashboard for session merry-boar-479.
Pushing to session/merry-boar-479-brief-a-wrapup advances this PR.

Worker attestation

Before flipping this PR to ready for review, confirm each item:

• Title describes the change (not the session id or branch).
• PR body summarises what and why (replace the TODO below).
• Tests run: name the command (e.g. npm test, cargo test) and the result.
• If this closes a work item, the body contains a Closes #N directive.
• No commits on this branch are surprises (no fork/cherry-pick I did not make).
• No secrets / credentials / large binaries staged.

Summary

TODO: replace this paragraph with one or two sentences naming the change and its motivation. Reviewers read this first.

Test plan

• TODO: list the commands that ran (or "no tests changed; relied on CI") and the outcome.

[gunbai-bot]

Closing: this was a 12-line doc-only wrapup that also closed the mechanism PR #7093 by mistake. #7093 is reopened (mechanism intact); the debt-classification fix is being applied on top of it directly. The §10 'landed #7101' note will ride with the design-doc edits already on #7093.