fix(rotator_library): 🐛 strip unsupported validation keywords for Gemini

Gemini's Proto-based API rejects exclusiveMinimum, exclusiveMaximum,
and other JSON Schema validation keywords with "Unknown name" errors.
Previously these were only stripped for Claude targets. Now stripped
for all targets since neither API supports them.

Author: FammasMaz

src/rotator_library/providers/antigravity_provider.py

@@ -761,10 +761,10 @@ def _clean_claude_schema(schema: Any, for_gemini: bool = False) -> Any:
     # - "format" (export, date/time tools)
     # - "minimum"/"maximum" (range tools)
     #
-    # Keywords to strip for Claude only (Gemini with 'parametersJsonSchema' accepts these,
-    # but we now use 'parameters' key which may silently ignore some):
+    # Keywords to strip for ALL targets (both Claude and Gemini):
+    # Gemini's Proto-based API rejects these with "Unknown name" errors.
     # Note: $schema, default, examples, title moved to meta_keywords (always stripped)
-    validation_keywords_claude_only = {
+    unsupported_validation_keywords = {
         "minItems",
         "maxItems",
         "uniqueItems",
@@ -883,12 +883,9 @@ def _clean_claude_schema(schema: Any, for_gemini: bool = False) -> Any:
         if key == "const":
             continue
 
-        # Strip Claude-only keywords when not targeting Gemini
-        if key in validation_keywords_claude_only:
-            if for_gemini:
-                # Gemini accepts these - preserve them
-                cleaned[key] = value
-            # For Claude: skip - not supported
+        # Strip unsupported validation keywords for ALL targets (both Claude and Gemini)
+        # Gemini's Proto-based API rejects these with "Unknown name" errors
+        if key in unsupported_validation_keywords:
             continue
 
         # Special handling for additionalProperties:
@@ -920,7 +917,7 @@ def _clean_claude_schema(schema: Any, for_gemini: bool = False) -> Any:
             for prop_name, prop_schema in value.items():
                 # Log warning if property name matches a validation keyword
                 # This helps debug potential issues where the old code would have dropped it
-                if prop_name in validation_keywords_claude_only:
+                if prop_name in unsupported_validation_keywords:
                     lib_logger.debug(
                         f"[Schema] Preserving property '{prop_name}' (matches validation keyword name)"
                     )