chore: strip the comments this branch added

Removes every comment introduced on this branch: website/ in full, pages.yml
in full, and only the blocks added to ci.yml and release.yml — their
pre-existing comments are untouched.

Two directives survive because they are load-bearing rather than prose: the
triple-slash vite/client reference, and nothing else.

Two comments were carrying behaviour that the code did not state, so the
code now states it. useCopy's rejection handler clears the copied flag
instead of sitting empty, and writeTheme returns whether the write actually
landed instead of swallowing the failure in a bare catch. isExternal drops
its regex for two startsWith calls, which reads the same and no longer
hides a `//` inside a literal.

website/src/pages/install.tsx

@@ -22,7 +22,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }`
 
-// LIB_SRC carries no comment lines, so every line is plain code.
 const LIB_LINES: TermLine[] = LIB_SRC.split('\n').map((text) => ({
   t: 'code' as const,
   text,
@@ -255,12 +254,6 @@ export const Install = () => {
               <h3 className="mb-4 text-heading leading-[var(--text-heading--line-height)] font-medium">
                 {platform.name}
               </h3>
-              {/*
-                Label beside value while the card is full width, label above it
-                once the cards go three up: at a third of the row the label
-                column ate enough of the line that every path broke mid-token
-                ("config.to / ml"). Stacking gives the path the whole card.
-              */}
               <dl className="grid grid-cols-1 gap-x-3.5 gap-y-0.5 sm:grid-cols-[auto_1fr] sm:gap-y-2 lg:grid-cols-1 lg:gap-y-0.5">
                 {(
                   [
@@ -339,9 +332,6 @@ export const Install = () => {
           />
         </Cols>
         <div className="mt-5">
-          {/* Raised, not panel: this section is a band, which is itself
-              bg-panel — a panel-on-panel callout has only a 1.36:1 hairline
-              holding it together. */}
           <Callout className="bg-raised" title="two things it will not touch">
             <p>
               Your downloads and your shared directories are yours: they stay exactly where