requestor-attribution

At worker session start, parse $PYLOT_REQUESTORS and set up commit and PR attribution so that the humans who triggered the mission are credited in git history and on GitHub.

When $PYLOT_REQUESTORS is unset or empty, every section below is a no-op — no error, no output change, no extra trailers.

Session Start — Parse requestors

Run once at the beginning of the session before any commits or PRs: