D4 review fix round.
P2: the org inbox took the hire form's HTML before its workspace read, so typing or a
submit result that landed during a slow read was painted over with the older draft.
inboxPage now takes a function and calls it while building the page after the read.
Two browser cases hold the inbox read: typing during it, and a refused start that
resolves during it, both survive the repaint (both fail on the previous commit).
P3: a hire start passes a bus code through only when the broker raises it before it
records the decision (hire-decisions prepare: the model route codes,
definition-not-hireable, definition-shared, no-chief-of-staff). Every other code,
including revision-conflict-revoked, request-timeout, invalid-envelope,
incomplete-request and codes the resolve or apply steps can raise, stays
outcome-unknown. Messages are worded for hire, fire and change alike.