docs: comments state what is, not how it came to be

The loader build, the gate script and the line-ending rule each carried the
story of their arrival - a measurement off the bench, a loop got wrong by
hand, a checkout reached from two hosts - where a sentence of what holds now
is enough. .gitattributes loses two patterns for files this repository does
not have, .clangd its two non-ASCII dashes, two headers a "per C" that read
as a stripped degree sign, and the README a "(new)" and the port's own
first attempt at stopping monitor.

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

.clangd

@@ -5,7 +5,7 @@ CompileFlags:
   Add:
     # clang has no 24-bit integer and GCC's are keywords, not macros, so the
     # editor needs a stand-in for avr::uint24_t. The next width up is the only
-    # one available — clang rejects _BitInt(24) on this target.
+    # one available - clang rejects _BitInt(24) on this target.
     - -D__uint24=unsigned long
     - -D__int24=long
     # clangd forwards the driver's system includes but not its own header
@@ -14,7 +14,7 @@ CompileFlags:
     - -D__STDC_LIMIT_MACROS
     - -D__STDC_CONSTANT_MACROS
     # isr::emit spells a vector number into [[gnu::signal(N)]], which clang
-    # rejects rather than ignores — enough of them in one TU to reach the
+    # rejects rather than ignores - enough of them in one TU to reach the
     # default limit of 19 inside the headers and truncate the parse.
     - -ferror-limit=0
   Remove: