Decouple non-UI CLI startup from config_ui

Stop aman.py from importing the GTK settings module at module load so version, init, bench, diagnostics, and top-level help can start without pulling in the UI stack.\n\nPromote PyGObject and python-xlib into main project dependencies, switch the documented source install surface to plain uv/pip commands, and teach the portable, deb, and Arch packaging flows to install filtered runtime requirements before the Aman wheel so they still rely on distro-provided GTK/X11 packages.\n\nAdd regression coverage for importing aman with config_ui blocked and for the portable bundle's new requirements payload, then rerun the focused CLI/diagnostics/portable tests plus py_compile.

packaging/arch/PKGBUILD.in

@@ -14,6 +14,25 @@ sha256sums=('__TARBALL_SHA256__')
 prepare() {
   cd "${srcdir}/aman-${pkgver}"
   python -m build --wheel
+  python - <<'PY'
+from pathlib import Path
+import re
+import tomllib
+
+project = tomllib.loads(Path("pyproject.toml").read_text(encoding="utf-8"))
+exclude = {"pygobject", "python-xlib"}
+dependencies = project.get("project", {}).get("dependencies", [])
+filtered = []
+for dependency in dependencies:
+    match = re.match(r"\s*([A-Za-z0-9_.-]+)", dependency)
+    if not match:
+        continue
+    name = match.group(1).lower().replace("_", "-")
+    if name in exclude:
+        continue
+    filtered.append(dependency.strip())
+Path("dist/runtime-requirements.txt").write_text("\n".join(filtered) + "\n", encoding="utf-8")
+PY
 }
 
 package() {
@@ -21,7 +40,8 @@ package() {
   install -dm755 "${pkgdir}/opt/aman"
   python -m venv --system-site-packages "${pkgdir}/opt/aman/venv"
   "${pkgdir}/opt/aman/venv/bin/python" -m pip install --upgrade pip
-  "${pkgdir}/opt/aman/venv/bin/python" -m pip install "dist/aman-${pkgver}-"*.whl
+  "${pkgdir}/opt/aman/venv/bin/python" -m pip install --requirement "dist/runtime-requirements.txt"
+  "${pkgdir}/opt/aman/venv/bin/python" -m pip install --no-deps "dist/aman-${pkgver}-"*.whl
 
   install -Dm755 /dev/stdin "${pkgdir}/usr/bin/aman" <<'EOF'
 #!/usr/bin/env bash

packaging/portable/portable_installer.py

@@ -358,6 +358,10 @@ def _copy_bundle_support_files(bundle_dir: Path, stage_dir: Path) -> None:
 def _run_pip_install(bundle_dir: Path, stage_dir: Path, python_tag: str) -> None:
     common_dir = _require_bundle_file(bundle_dir / "wheelhouse" / "common", "common wheelhouse")
     version_dir = _require_bundle_file(bundle_dir / "wheelhouse" / python_tag, f"{python_tag} wheelhouse")
+    requirements_path = _require_bundle_file(
+        bundle_dir / "requirements" / f"{python_tag}.txt",
+        f"{python_tag} runtime requirements",
+    )
     aman_wheel = _aman_wheel(common_dir)
     venv_dir = stage_dir / "venv"
     _run([sys.executable, "-m", "venv", "--system-site-packages", str(venv_dir)])
@@ -372,6 +376,22 @@ def _run_pip_install(bundle_dir: Path, stage_dir: Path, python_tag: str) -> None
             str(common_dir),
             "--find-links",
             str(version_dir),
+            "--requirement",
+            str(requirements_path),
+        ]
+    )
+    _run(
+        [
+            str(venv_dir / "bin" / "python"),
+            "-m",
+            "pip",
+            "install",
+            "--no-index",
+            "--find-links",
+            str(common_dir),
+            "--find-links",
+            str(version_dir),
+            "--no-deps",
             str(aman_wheel),
         ]
     )