fix: stop spinner before streaming output to prevent double-rendering

The spinner was continuing to write to stderr every 80ms while command
output was being streamed to stdout in tee/capture modes. This caused
overlapping text as the spinner's carriage returns interfered with
the markdown renderer's output.

Added stopSpinner() calls at the start of both tee and capture mode
blocks in runCommand() to ensure clean output.

Author: johnlindquist

src/command.ts

@@ -408,6 +408,9 @@ export async function runCommand(ctx: RunContext): Promise<RunResult> {
 
   // Handle output based on mode
   if (mode === "tee") {
+    // Stop spinner before streaming output starts
+    stopSpinner();
+
     // Tee mode: stream to console while capturing (with markdown rendering)
     const promises: Promise<void>[] = [];
 
@@ -429,6 +432,9 @@ export async function runCommand(ctx: RunContext): Promise<RunResult> {
 
     await Promise.all(promises);
   } else if (mode === "capture") {
+    // Stop spinner before reading output
+    stopSpinner();
+
     // Capture mode: buffer then print (with markdown rendering)
     if (proc.stdout) {
       stdout = await new Response(proc.stdout).text();