fix: report errors to progress comment when agent fails without throwing (#376)

* fix: report errors to progress comment when agent fails without throwing

when an agent returns success: false without throwing (e.g., opencode exits
with code 0 despite provider errors), the catch block in main.ts is never
reached, leaving the progress comment stuck on "leaping into action."

two fixes:
- opencode: return success: false when 0 events processed and a provider
  error was detected (converts silent failures to explicit failures)
- main.ts: after handleAgentResult, check if the progress comment was ever
  updated — if not, report the error to the comment as a safety net

Co-authored-by: Cursor <cursoragent@cursor.com>

* address review: use result directly and force failure on unreported progress

* refactor: move safety-net logic into handleAgentResult

---------

Co-authored-by: pullfrog[bot] <226033991+pullfrog[bot]@users.noreply.github.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Anna Bocharova <robin_tail@me.com>

entry

@@ -146353,6 +146353,14 @@ ${stderrContext}`);
           usage
         };
       }
+      if (eventCount === 0 && lastProviderError) {
+        return {
+          success: false,
+          output: finalOutput || output,
+          error: `provider error: ${lastProviderError}`,
+          usage
+        };
+      }
       return {
         success: true,
         output: finalOutput || output,
@@ -147335,18 +147343,34 @@ function resolvePayload(resolvedPromptInput, repoSettings) {
 }
 
 // utils/run.ts
-function handleAgentResult(result) {
-  if (!result.success) {
+async function handleAgentResult(ctx) {
+  if (!ctx.result.success) {
     return {
       success: false,
-      error: result.error || "Agent execution failed",
-      output: result.output
+      error: ctx.result.error || "Agent execution failed",
+      output: ctx.result.output
+    };
+  }
+  if (!ctx.toolState.wasUpdated && ctx.toolState.progressCommentId && !ctx.silent) {
+    const error49 = ctx.result.error || "agent completed without reporting progress";
+    try {
+      await reportErrorToComment({
+        toolState: ctx.toolState,
+        error: error49,
+        title: "Error"
+      });
+    } catch {
+    }
+    return {
+      success: false,
+      error: error49,
+      output: ctx.result.output || ""
     };
   }
   log.success("Task complete.");
   return {
     success: true,
-    output: result.output || ""
+    output: ctx.result.output || ""
   };
 }
 
@@ -147696,8 +147720,13 @@ ${instructions.user}` : null,
         if (toolState.output) {
           log.info(`::pullfrog-output::${Buffer.from(toolState.output).toString("base64")}`);
         }
+        const mainResult = await handleAgentResult({
+          result,
+          toolState,
+          silent: payload.event.silent ?? false
+        });
         return {
-          ...handleAgentResult(result),
+          ...mainResult,
           result: toolState.output
         };
       } catch (_) {