ci: add typechecking, fail fast in CI, and patch typechecking errors (#63)

src/cli/helpers/backfill.ts

@@ -123,6 +123,9 @@ export function backfillBuffers(
         if (toolCalls.length > 0 && toolCalls[0]?.tool_call_id) {
           const toolCall = toolCalls[0];
           const toolCallId = toolCall.tool_call_id;
+          // Skip if any required fields are missing
+          if (!toolCallId || !toolCall.name || !toolCall.arguments) break;
+
           const exists = buffers.byId.has(lineId);
 
           buffers.byId.set(lineId, {

src/cli/helpers/formatArgsDisplay.ts

@@ -23,11 +23,13 @@ export function formatArgsDisplay(argsJson: string): {
         if ("request_heartbeat" in clone) delete clone.request_heartbeat;
         parsed = clone;
         const keys = Object.keys(parsed);
+        const firstKey = keys[0];
         if (
           keys.length === 1 &&
-          ["query", "path", "file_path", "command", "label"].includes(keys[0])
+          firstKey &&
+          ["query", "path", "file_path", "command", "label"].includes(firstKey)
         ) {
-          const v = parsed[keys[0]];
+          const v = parsed[firstKey];
           display = typeof v === "string" ? v : String(v);
         } else {
           display = Object.entries(parsed)

src/cli/helpers/stream.ts

@@ -191,7 +191,7 @@ export async function drainStreamWithResume(
 
       // Use the resume result (should have proper stop_reason now)
       result = resumeResult;
-    } catch (e) {
+    } catch (_e) {
       // Resume failed - stick with the error stop_reason
       // The original error result will be returned
     }