Align module release documentation with implemented behavior

docs/internal/gotool.md

@@ -54,8 +54,10 @@ file.
 
 The operation-local owner snapshots the inherited environment and selected
 settings file. It reuses the resolved tool across validation and its following
-build callback while those inputs match, and rediscovers after a consumer
-callback changes either input. It does not cache settings across operations.
+build callback while those inputs match. Subsequent Go acquisition rediscovers
+settings when a consumer callback changes either input. An unavailable snapshot
+disables reuse while discovery follows the Go tool's accepted configuration.
+Ownership is operation-local.
 
 Configuration discovery parses JSON from stdout. Stderr is captured separately
 and included in command-failure diagnostics, so a successful query can emit