fix: show a readable installer banner

docs/self-evolution.md

@@ -9,7 +9,7 @@ Historical verification snapshot: `51be33361422e55e1f2f00c33a0e0f8c56132a91`
 (the post-#54 `main` revision, captured before this #55 documentation-only
 update). Snapshot date: 2026-09-04.
 
-Current repository test count at this snapshot: **195 unittest cases**.
+Current repository test count at this snapshot: **196 unittest cases**.
 
 ## Verified surface
 

install.ps1

@@ -21,11 +21,7 @@ $releaseWheelUrl = "https://github.com/EvanProgramming/OpenKyrozen/releases/down
 $homeDirectory = if ($env:HOME) { $env:HOME } else { $env:USERPROFILE }
 
 Write-Output ""
-Write-Output "  ____  ____  _____ _   _ ____  _____ _   _  ____  _   _ "
-Write-Output " / __ \/ __ \/ ____| \ | |  _ \| ____| \ | |/ ___|| | | |"
-Write-Output "| |  | | |  | | |    |  \| | |_) |  _| |  \| | |    | | | |"
-Write-Output "| |__| | |__| | |____| |\  |  __/| |___| |\  | |___ | |_| |"
-Write-Output " \____/\____/ \_____|_| \_|_|   |_____|_| \_|\____| \___/ "
+Write-Output "OPENKYROZEN"
 Write-Output "OpenKyrozen computer-native installer"
 Write-Output ""
 

install.sh

@@ -5,13 +5,8 @@ set -eu
 info() { printf '%s\n' "[INFO] $*"; }
 fail() { printf '%s\n' "[ERROR] $*" >&2; exit 1; }
 
-printf '%s\n' \
-  '  ____  ____  _____ _   _ ____  _____ _   _  ____  _   _ ' \
-  ' / __ \/ __ \/ ____| \ | |  _ \| ____| \ | |/ ___|| | | |' \
-  '| |  | | |  | | |    |  \| | |_) |  _| |  \| | |    | | | |' \
-  '| |__| | |__| | |____| |\  |  __/| |___| |\  | |___ | |_| |' \
-  ' \____/\____/ \_____|_| \_|_|   |_____|_| \_|\____| \___/ '
-printf '%s\n\n' 'OpenKyrozen computer-native installer'
+printf '%s\n' 'OPENKYROZEN' 'OpenKyrozen computer-native installer'
+printf '\n'
 
 release_version='2.0.2'
 release_tag="v$release_version"

tests/test_distribution.py

@@ -95,6 +95,14 @@ def test_posix_installer_has_valid_syntax_and_idempotent_user_path_logic(self):
         self.assertNotIn("pypi.org", text)
         self.assertIn("installed_version=", text)
 
+    def test_installers_use_plain_canonical_banner(self):
+        for name in ("install.sh", "install.ps1"):
+            text = (ROOT / name).read_text(encoding="utf-8")
+            with self.subTest(installer=name):
+                self.assertIn("OPENKYROZEN", text)
+                self.assertIn("computer-native installer", text)
+                self.assertNotIn("____", text)
+
     def test_powershell_installer_is_static_safe_and_parses_when_available(self):
         installer = ROOT / "install.ps1"
         text = installer.read_text(encoding="utf-8")