Delete Tailwind's half and build the Workbench without it

Plan step 39 (parts 1-3, folded into one commit: PHP tests read the
deleted files directly, so they cannot land apart from it). Tailwind
leaves the whole stack:

- Delete resources/css/tailwind.css, tokens/theme.css and
  tokens/utilities.css. Neither token file declared an --md-sys-*
  custom property of its own (both only referenced tokens declared
  elsewhere), so nothing loses a value; the md-* interaction and text
  classes already mirror utilities.css's declarations exactly
  (foundation/interaction.css, text.css).
- npm uninstall tailwindcss @tailwindcss/vite; vite.config.js drops the
  plugin and its import; composer.json drops the tailwindcss keyword
  (no lock change — keywords are outside Composer's content hash).
- The Workbench now builds one CSS entry, workbench/resources/css/app.css
  (all.css, showcase.css and the scheme; package.css is folded in and
  removed) instead of two, used by ErrorPage::assets() and every
  browser-test probe page's raw @vite() call; the showcase's own pages
  still take their CSS from the bundle route.
- TokensTest and StylesheetsTest: the two facts theme.css and
  utilities.css carried (every scheme role becomes a colour, resolved
  on the element; md-type-* matches the type-* utilities) are asserted
  directly against the scheme and text.css now that there is no second
  copy to cross-check; StylesheetsTest gained a full-tree scan (every
  .css file under resources/css/ is reached from all.css or
  showcase.css, no exclusions left for Tailwind); the Workbench-entry
  test and every "moved out of tailwind.css" assertion updated for the
  single entry and its removal.
- DesignGuard.php's comments and the development skill's setup section
  no longer name the deleted files or a second Tailwind entry.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

src/Testing/DesignGuard.php

@@ -10,9 +10,9 @@ use Symfony\Component\Finder\Finder;
  * Finds what compiles to nothing and fails silently: maryUI tags, daisyUI classes, colours the
  * theme does not declare, icon names that are not Material Symbols, Tailwind's breakpoint
  * prefixes and the radius, shadow, type-size, weight, leading, tracking, easing and duration
- * scales that tokens/theme.css clears for M3's own, and colours written as a literal value
- * instead of a role — plus whatever an application bans on top (roles its own design rules
- * leave out, the two absolutes, opacity used as emphasis, patterns it has retired).
+ * scales M3's own sets replace, and colours written as a literal value instead of a role — plus
+ * whatever an application bans on top (roles its own design rules leave out, the two absolutes,
+ * opacity used as emphasis, patterns it has retired).
  *
  *     expect(DesignGuard::scan([resource_path('views'), resource_path('js'), app_path()])
  *         ->forbidColours(['tertiary', 'primary-container'])
@@ -52,10 +52,10 @@ class DesignGuard
     protected const string OPACITY_INK = '/(?<![\w-])(?:bg|text|border(?:-[trblxyse])?)-[a-z][a-z\d-]*\/\d{1,3}(?![\w-])/';
 
     /**
-     * Tailwind's breakpoint prefixes, cleared by tokens/theme.css, and the M3 window size class
-     * that replaces each. Tailwind's 640/768/1024/1280/1536 are 40–88 px from M3's 600/840/1200/
-     * 1600, so a prefix maps to the class that carries the same intent, never to the same pixel:
-     * both of its phone breakpoints are M3's medium.
+     * Tailwind's breakpoint prefixes and the M3 window size class that replaces each. Tailwind's
+     * 640/768/1024/1280/1536 are 40–88 px from M3's 600/840/1200/1600, so a prefix maps to the
+     * class that carries the same intent, never to the same pixel: both of its phone breakpoints
+     * are M3's medium.
      */
     protected const array WINDOW_CLASSES = [
         'sm' => 'medium',
@@ -293,7 +293,7 @@ class DesignGuard
 
     /**
      * The radius, shadow, type-size, weight, leading, tracking, easing and duration utilities
-     * Tailwind ships and tokens/theme.css clears.
+     * Tailwind ships and M3's own scales replace.
      *
      * @return list<string>
      */