diff --git a/scripts/build.py b/scripts/build.py
index 63c4001..b62b60a 100755
--- a/scripts/build.py
+++ b/scripts/build.py
@@ -693,9 +693,22 @@ def run_builds(
     for r in results:
         _print_platform_log(r, verbose)
 
+    _write_build_log(root / OUT / "build.log", results)
+
     return results
 
 
+def _write_build_log(path: Path, results: list[PlatformResult]) -> None:
+    with open(path, "w") as f:
+        for r in results:
+            status = "OK" if r.success else "FAIL"
+            f.write(f"=== {r.platform.label} [{status}] {r.elapsed:.1f}s ===\n")
+            for line in r.log_lines:
+                f.write(line + "\n")
+            f.write("\n")
+    console.print(f"  [dim]Build log written to {path}[/]")
+
+
 _FAILURE_LOG_TAIL = 50
 
 
@@ -721,31 +734,6 @@ def _print_platform_log(r: PlatformResult, verbose: bool = False) -> None:
 # ---------------------------------------------------------------------------
 
 
-def _native_platforms(platforms: list[Platform]) -> list[Platform]:
-    return [p for p in platforms if p.native]
-
-
-def _platforms_by_os(platforms: list[Platform], os_name: str) -> list[Platform]:
-    return [p for p in platforms if p.os == os_name]
-
-
-def _build_presets(platforms: list[Platform]) -> list[tuple[str, list[Platform], BuildConfig]]:
-    """Build a list of (label, platforms, config) presets."""
-    presets: list[tuple[str, list[Platform], BuildConfig]] = []
-
-    native = _native_platforms(platforms)
-    if native:
-        label = ", ".join(p.label for p in native)
-        presets.append((f"This machine ({label})", native, BuildConfig()))
-
-    macos = _platforms_by_os(platforms, "macos")
-    if len(macos) > 1:
-        presets.append(("macOS all (arm64 + x86_64)", macos, BuildConfig()))
-
-    presets.append(("Full release (all platforms, all targets)", list(platforms), BuildConfig()))
-    presets.append(("CLI only (all platforms, no desktop/plugins)", list(platforms), BuildConfig(desktop=False, plugins=False)))
-    return presets
-
 
 def _ask_or_exit(prompt) -> any:
     result = prompt.ask()
@@ -757,24 +745,6 @@ def _ask_or_exit(prompt) -> any:
 def prompt_interactive(
     all_platforms: list[Platform], alias_map: dict[str, Platform],
 ) -> tuple[list[Platform], BuildConfig]:
-    presets = _build_presets(all_platforms)
-
-    choices = [
-        *[questionary.Choice(label, value=i) for i, (label, _, _) in enumerate(presets)],
-        questionary.Separator(),
-        questionary.Choice("Custom...", value="custom"),
-    ]
-
-    pick = _ask_or_exit(questionary.select(
-        "Build profile:", choices=choices, style=PROMPT_STYLE,
-    ))
-
-    if pick != "custom":
-        _, platforms, config = presets[pick]
-        _print_summary(platforms, config)
-        return platforms, config
-
-    # Custom: platform checkboxes
     plat_choices = [questionary.Choice(p.label, value=p.alias, checked=p.native) for p in all_platforms]
     selected_aliases = _ask_or_exit(questionary.checkbox(
         "Platforms:", choices=plat_choices, style=PROMPT_STYLE,
@@ -783,7 +753,6 @@ def prompt_interactive(
         selected_aliases = [p.alias for p in all_platforms]
     platforms = [alias_map[a] for a in selected_aliases]
 
-    # Custom: target checkboxes
     target_choices = [
         questionary.Choice("CLI", value="cli", checked=True),
         questionary.Choice("Desktop", value="desktop", checked=True),