docs: drop the comma outside the closing quote in coordinator.md

argus's review on this PR caught a real regression: the earlier
passive-voice rewrite ('answers "did the agent come back up?", the
same way...') put a comma immediately outside a closing double-quote,
which vale's Microsoft.Quotes rule flags ("punctuation should be
inside the quotes") -- a brand new error not present on main. The
original phrasing never had a quote directly followed by a comma, so
this was a real side effect of the rewrite, not a pre-existing hit.

Simplest fix: drop the comma. The sentence reads fine without it and
the closing "?" already does the job.

Verified via vale: back to 2 errors (matching main's baseline, down
from the 3 this rewrite introduced), write-good.Passive count
unchanged at 24.

docs/scheduler/coordinator.md

@@ -450,7 +450,7 @@ own. Its `DeployApply` node doesn't build: it merges, opens the two-phase
 meta deploy, and returns the chain above as a subgraph the scheduler grafts
 into the live DAG under that node. A `FinalizeDeploy` node gated on the
 graft's completion then plants the deploy tag — so `Reconcile`'s success
-answers "did the agent come back up?", the same way it does for every
+answers "did the agent come back up?" the same way it does for every
 other rebuild, instead of a fused inline start.
 
 The grafted nodes land _inside_ `DeployWindow`'s subtree, so they re-enter