fix(issue-17): review R1 - the finalizer ends with its wrapper

finalize-end ran the disk grace and the broker re-observation as a child
of the wrapper; TERM to the wrapper left it running, and at the deadline it
still closed the job and published the error (codex R1, reproduced with the
real registry). The bash loops it replaced ended with the wrapper.

The wrapper now passes its own pid (--watch-pid "$$", as for the stall
watcher). finalize-end checks it every 0.2 s through both waits and before
the close and the event, and leaves without either once it is gone.
A comparison test sends TERM to the old and the new wrapper inside each
grace: both exit at once, leave no process behind and make no call.

Also: no blank line at the end of the old-decisions fixture, and the #42
inventory follows main() one line down.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/data/issue17_item4_old_decisions.sh

@@ -261,4 +261,3 @@ cmd_wait() {
   [ "$rc" -eq "$SUB_RC_WALL_CLOCK" ] && rc=$SUB_RC_NO_EVENT
   return "$rc"
 }
-