feat: suppress warnings in JSON output and enhance upload endpoint metadata for file size limits

Co-authored-by: Copilot <copilot@github.com>

Author: alfarahn

src/Dashboard/AI/Tools/Resources/file_inspect.py

@@ -29,8 +29,14 @@
 import os
 import sys
 import traceback
+import warnings
 from typing import Any
 
+# stdout MUST be pure JSON — route every warning to stderr so a stray
+# pandas/pyarrow DeprecationWarning can't corrupt the response.
+warnings.simplefilter("ignore")
+warnings.showwarning = lambda *a, **kw: None
+
 # Hard caps — these protect the LLM context window
 MAX_ROWS_PER_CALL = 200
 MAX_TEXT_CHARS_PER_CALL = 8000

src/Dashboard/Web/UploadEndpoints.cs

@@ -76,7 +76,9 @@ public static void MapUploadEndpoints(this IEndpointRouteBuilder app)
             }
 
             return Results.Ok(new { files = results });
-        }).DisableAntiforgery();
+        })
+        .DisableAntiforgery()
+        .WithMetadata(new Microsoft.AspNetCore.Mvc.RequestSizeLimitAttribute(MaxBytes + 10L * 1024 * 1024)); // file cap + multipart overhead
 
         app.MapGet("/api/uploads", (HttpContext ctx) =>
         {