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>

oracle/README.md

@@ -13,9 +13,9 @@ in AVR assembly. It is the size-and-feature bar for the port's `tsb_asm` tier.
 
 ## Why this variant
 
-The user chose the fixed-baud, hardware-UART variant deliberately: it is the one
-whose feature set the port must match. It fits the **complete** TSB feature set
-into the 512-byte ATmega boot section:
+The fixed-baud, hardware-UART variant is the one whose feature set the port must
+match. It fits the **complete** TSB feature set into the 512-byte ATmega boot
+section:
 
 | Feature | Oracle routine |
 |---|---|