fix(cli): suppress ANSI escape codes in non-TTY progress output

renderProgress() was writing \r\x1b[2K escape codes even when stdout
is not a TTY, corrupting output for CI pipelines and AI agents.
Now writes clean text lines at 10% intervals when not a TTY.

Reproducer:
  cd my-video
  npx hyperframes render --output out.mp4 2>&1 | cat
  # Output contained raw escape codes: \x1b[2K

packages/cli/src/ui/progress.ts

@@ -2,7 +2,19 @@ import { c } from "./colors.js";
 
 const { stdout } = process;
 
+let lastPrintedThreshold = -1;
+
 export function renderProgress(percent: number, stage: string, row?: number): void {
+  // Non-TTY: write clean lines at 10% intervals, skip bar computation entirely
+  if (!stdout.isTTY) {
+    const rounded = Math.round(percent);
+    if ((rounded % 10 === 0 || rounded === 100) && rounded !== lastPrintedThreshold) {
+      lastPrintedThreshold = rounded;
+      stdout.write(`  ${rounded}%  ${stage}\n`);
+    }
+    return;
+  }
+
   const width = 25;
   const filled = Math.floor(percent / (100 / width));
   const empty = width - filled;
@@ -10,7 +22,7 @@ export function renderProgress(percent: number, stage: string, row?: number): vo
 
   const line = `  ${bar}  ${c.bold(String(Math.round(percent)) + "%")}  ${c.dim(stage)}`;
 
-  if (row !== undefined && stdout.isTTY) {
+  if (row !== undefined) {
     stdout.write(`\x1b[${row};1H\x1b[2K${line}`);
   } else {
     stdout.write(`\r\x1b[2K${line}`);