Reviewers list the files they read #489

Parent

#486

What to build

Each reviewer says what it read, and the review closes the gaps once:

• Both briefs ask for a list. Each of the thirdshift-code-review skill's two sub-agent briefs asks the sub-agent to list the files it read.
• One retry. The skill compares each list with the change's files, and sends any changed file a sub-agent didn't read back to it once. On a Harness where a finished sub-agent can't be asked again, a fresh one reads just those files.
• The rest is named. The aggregated report names any changed file still unread.
• The PR body shows it. The shared review instruction tells the author to name, in the pull request body, any changed file the review left unread.

Acceptance criteria

• Both briefs ask for the list of files read.
• A changed file missing from a sub-agent's list goes back to it once, and only once. A file still unread after that is reported, not retried.
• The aggregated report names every changed file still unread, or says none is.
• The prompts page shows the four prompts asking for unread changed files to be named in the pull request body.

Blocked by

• Correctness findings carry a test the author runs, and every decline cites its evidence #488