Fix read-file from exploding with path not found error.

- There were a few hiccups here. Somehow 2.5-flash wasn't actually abiding by our tool schema. Instead it was inferring `path`. To semi-combat this I've renamed `file_path` -> `path`.
- We weren't elevating errors that were created via schema validation. Instead both the `glob` and `read-file.ts` now surface this.
- In error scenarios (like failing schema) we were improperly surfacing these as success cases because we were overriding tool status.

packages/server/src/tools/glob.ts

@@ -149,7 +149,7 @@ export class GlobLogic extends BaseTool<GlobToolParams, ToolResult> {
     if (validationError) {
       return {
         llmContent: `Error: Invalid parameters provided. Reason: ${validationError}`,
-        returnDisplay: `Error: Failed to execute tool.`,
+        returnDisplay: validationError,
       };
     }