style: fix ruff lint violations across service and tests

Wraps over-long lines, sorts imports, drops an unused local, and bumps the
agent submodule for its own import-sort fix so make check passes.

src/gewu/domain/contracts.py

@@ -490,7 +490,12 @@ class OnlineEvidence(StrictRecord):
     def public_http_url(cls, value: str) -> str:
         parsed = urlsplit(value)
         hostname = parsed.hostname
-        if parsed.scheme not in {"http", "https"} or not hostname or parsed.username or parsed.password:
+        if (
+            parsed.scheme not in {"http", "https"}
+            or not hostname
+            or parsed.username
+            or parsed.password
+        ):
             raise ValueError("online evidence requires an HTTP(S) URL without embedded credentials")
         if hostname.lower() == "localhost" or hostname.lower().endswith((".localhost", ".local")):
             raise ValueError("web references must use a public hostname")
@@ -830,14 +835,20 @@ class KnowledgeBrowseRequest(StrictRecord):
     as_of_from: date | None = None
     as_of_to: date | None = None
     stale_only: bool = False
-    order: Literal["title_asc", "title_desc", "date_newest", "date_oldest", "relevance"] = "title_asc"
+    order: Literal[
+        "title_asc", "title_desc", "date_newest", "date_oldest", "relevance"
+    ] = "title_asc"
     limit: int = Field(default=20, ge=1, le=50)
     cursor: str | None = Field(default=None, max_length=512)
     budget_tokens: int = Field(ge=256, le=50_000)
 
     @model_validator(mode="after")
     def validate_browse(self) -> KnowledgeBrowseRequest:
-        if self.as_of_from is not None and self.as_of_to is not None and self.as_of_from > self.as_of_to:
+        if (
+            self.as_of_from is not None
+            and self.as_of_to is not None
+            and self.as_of_from > self.as_of_to
+        ):
             raise ValueError("as_of_from must not be later than as_of_to")
         if self.order == "relevance" and not self.query:
             raise ValueError("relevance ordering requires a search query")