chore: sync *.ps1 EOL fix from canonical

.editorconfig

@@ -26,12 +26,13 @@ indent_size = 2
 indent_size = 2
 
 # PowerShell files
-# PowerShell uses CRLF to maintain compatibility with Windows and PowerShell conventions
-# This overrides the global end_of_line = lf setting and aligns with .gitattributes line 14
+# Only the indent override is needed; LF + UTF-8 (no BOM) come from the
+# global [*] section above. LF + no-BOM is required for the
+# `#!/usr/bin/env pwsh` shebang at the top of every script in scripts/
+# to work on Linux/macOS — CR breaks the kernel's exec lookup, and a
+# leading BOM prevents shebang recognition entirely.
 [*.ps1]
 indent_size = 4
-end_of_line = crlf
-charset = utf-8-bom
 
 # C# files
 [*.cs]

.gitattributes

@@ -9,11 +9,14 @@
 *.fsx text eol=lf
 
 # Scripts
-# PowerShell scripts: CRLF line endings (intentional override)
-# Both .gitattributes and .editorconfig consistently configure PowerShell files
-# to use CRLF (Windows-style) line endings for PowerShell convention compliance.
-# See .editorconfig [*.ps1] section for the matching configuration.
-*.ps1 text eol=crlf
+# PowerShell scripts: LF line endings, no BOM. Required for the
+# `#!/usr/bin/env pwsh` shebang to work on Linux/macOS — the kernel
+# parses CR as part of the interpreter name (looking for `pwsh\r`),
+# and a UTF-8 BOM before `#!` prevents shebang recognition entirely.
+# Modern PowerShell 7+ handles LF on Windows transparently; Git's
+# autocrlf still gives Windows users CRLF in their working tree if
+# desired without forcing CRLF into the index.
+*.ps1 text eol=lf
 
 
 # Build and configuration files