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.

.github/workflows/pages.yml

@@ -1,7 +1,5 @@
 name: Pages
 
-# Only the website. The Rust workflows ignore this same path, so a site-only
-# push runs this alone and a code-only push never rebuilds the site.
 on:
   push:
     branches: [master]
@@ -29,8 +27,6 @@ jobs:
         with:
           bun-version: latest
 
-      # --frozen-lockfile so a drifted bun.lock fails here rather than
-      # silently shipping different dependency versions than were tested.
       - name: Install
         run: bun install --frozen-lockfile
 
@@ -40,8 +36,6 @@ jobs:
       - name: Lint
         run: bun run lint
 
-      # Emits one static HTML file per route plus a 404, so direct links
-      # answer 200 with real markup instead of the SPA shell.
       - name: Build
         run: bun run build
 
@@ -51,14 +45,10 @@ jobs:
 
   deploy:
     name: Deploy
-    # Pull requests get the build as a check; only master publishes.
     if: github.ref == 'refs/heads/master' && github.event_name != 'pull_request'
     needs: build
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    # Scoped to the deploy, not the workflow: a workflow-level group would
-    # queue PR builds behind an in-flight master deploy for no reason. Never
-    # cancel in flight — a half-uploaded artifact leaves the live site broken.
     concurrency:
       group: pages
       cancel-in-progress: false