Drop gum from the orchestrator's progress lines

The dashboard owns the visible UI: it captures the orchestrator's stdout into
the support log and strips CSI sequences on the way in, so the colouring was
never seen by anyone. gum charged a Go process start per line for it, on every
phase and every package group. Plain writes keep the same indented shape.

Flushing stays: pacstrap and arch-chroot inherit this fd, so buffering would
reorder our lines against theirs in the log.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

configs/airootfs/usr/share/omarchy-iso/orchestrator/ui.py

@@ -1,24 +1,28 @@
-"""Thin gum wrapper so the orchestrator keeps the same terminal UX as the
-existing bash installer."""
+"""Orchestrator progress lines.
+
+These land in the install log, not on a screen: omarchy-install-dashboard owns
+the visible UI, captures the orchestrator's stdout into the support log, and
+strips CSI sequences on the way in. The colouring was therefore never seen by
+anyone, while gum charged a Go process start per line for it. Plain writes keep
+the same indented shape at no cost.
+
+Flush every line: pacstrap and arch-chroot inherit this fd, so buffering here
+would reorder our lines against theirs in the log.
+"""
 
 from __future__ import annotations
 
-import subprocess
+import sys
 
 
-def style(text: str, *, foreground: str | None = None, padding: str | None = None) -> None:
-    cmd = ["gum", "style"]
-    if foreground:
-        cmd += ["--foreground", foreground]
-    if padding:
-        cmd += ["--padding", padding]
-    cmd.append(text)
-    subprocess.run(cmd, check=False)
+def _emit(text: str) -> None:
+    sys.stdout.write(f"\n    {text}\n")
+    sys.stdout.flush()
 
 
 def info(text: str) -> None:
-    style(text, foreground="3", padding="1 0 0 4")
+    _emit(text)
 
 
 def error(text: str) -> None:
-    style(text, foreground="1", padding="1 0 0 4")
+    _emit(text)