fix: dont compact standalone websearch schema (#24660)

add new `parse_tool_input_schema_without_compaction` to bypass the
existing compaction/trimming of client-provided tool schemas that are
over 4k bytes.

we want this for standalone web search to keep field guidance/metadata
on certain fields; this keeps us closer to parity with existing hosted
tool schema (which didnt go through this 4k byte filter).

codex-rs/app-server/tests/suite/v2/web_search.rs

@@ -112,9 +112,12 @@ async fn standalone_web_search_round_trips_encrypted_output() -> Result<()> {
     assert_eq!(requests.len(), 2);
 
     let first_response = requests[0].body_json();
-    assert!(
-        requests[0].tool_by_name("web", "run").is_some(),
-        "web.run should be sent to the model"
+    let web_run = requests[0]
+        .tool_by_name("web", "run")
+        .context("web.run should be sent to the model")?;
+    assert_eq!(
+        web_run.pointer("/parameters/properties/time/description"),
+        Some(&json!("Get time for the given UTC offsets."))
     );
     assert!(
         !has_hosted_web_search(&first_response),