chore: the editor config describes this repository, in ASCII

.clangd said the repository rides as a submodule in its consumers, which none
does, and removed three codegen flags only pureboot's loaders carry; its em
dashes are ASCII now. The settings.json comment built on the same premise goes,
and the oracle README states the variant rather than who chose it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.vscode/settings.json

@@ -5,9 +5,7 @@
 	"C_Cpp.intelliSenseEngine": "disabled",
 
 	// --query-driver lets clangd ask the cross compiler for its own system
-	// includes and target. The database is named here rather than in .clangd
-	// because that file travels with the driver into a consumer's submodule,
-	// where a build tree of this repo's own need not exist.
+	// includes and target.
 	"clangd.arguments": [
 		"--compile-commands-dir=${workspaceFolder}/build/atmega328p-generated",
 		"--query-driver=**avr-g++*",