style(cloud): reformat modules and restore except-tuple parentheses

Apply consistent line-length formatting across governance, plugins, the
SDK routers (governance_api, user_api), user_auth, and migrations
0003/0005/0006.

Also restore the parentheses on two except clauses that had been dropped
into invalid Python 3 `except A, B:` syntax: plugins._coerce_to_manifest
(KeyError, ValueError) and PasswordHasher.verify (InvalidHashError,
VerificationError). Both modules now import cleanly again.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/cloud-platform/cloud/user_auth.py

@@ -201,7 +201,9 @@ def utc_now() -> datetime:
     return datetime.now(UTC)
 
 
-def csrf_matches(*, csrf_cookie: str | None, csrf_header: str | None, session: UserSession) -> bool:
+def csrf_matches(
+    *, csrf_cookie: str | None, csrf_header: str | None, session: UserSession
+) -> bool:
     if not csrf_cookie or not csrf_header:
         return False
     if not compare_digest(csrf_cookie, csrf_header):
@@ -271,7 +273,11 @@ class UserAuthService:
             normalized,
             client_bucket,
         )
-        if throttle is not None and throttle.blocked_until and throttle.blocked_until > now:
+        if (
+            throttle is not None
+            and throttle.blocked_until
+            and throttle.blocked_until > now
+        ):
             self.password_hasher.verify_dummy(password)
             self._audit(
                 action="login",