docs: accept Python identifiers in control gate checks

Author: mgazza

.cspell/custom-dictionary-workspace.txt

@@ -241,6 +241,7 @@ foxess
 foxesscloud
 freephase
 fromisoformat
+fromlist
 fronius
 funcs
 futurerate
@@ -536,6 +537,7 @@ pypi
 pyproject
 pytest
 pythonhashseed
+PYTHONPATH
 pytz
 Quattro
 Qwen

docs/control-write-drain-gate.md

@@ -48,7 +48,7 @@ configuration revision, exact inverter identity and target provider. The source
 must close admission before returning evidence. Replayed, expired and mismatched
 receipts must be rejected. A fetched configuration revision is not evidence
 that the old writer stopped. Process restarts must reconstruct closed epochs
-rather than silently reverting to an ungated controller.
+rather than silently reverting to a controller with no gate.
 
 The Hub protocol must acknowledge an epoch/revision-bound physical fence after
 old commands have completed and old retained schedules have been invalidated.