T3.2 - C3/S5: one source of truth for colour; page sheets alias only

theme-light.css is now the only file in html/ that contains a colour literal.
The five page stylesheets and all four inline <style> blocks declare names and
nothing else.

  theme-light.css                 191 declarations, 175 with a literal value
  console.css                      28 declarations,   0
  work-package-suite-styles.css    16 declarations,   0
  wp-chrome.css                    14 declarations,   0
  wp-creation-styles.css           24 declarations,   0
  wp-sidenav.css                    0 declarations,   0

#0f62fe is declared in one sheet, down from five. The eleven occurrences left
inside theme-light.css are Carbon's own v10-to-v11 alias layer, which the
inventory records as deliberate and not the S5 defect.

Names were kept, because 111 var() references live in .js files across 23 token
names and a rename there fails silently - no build error, no console warning,
just an unstyled element.

The rule the refactor was built on: consolidation is not unification. Where two
sheets declared the same value, they collapse. Where they declared DIFFERENT
values for one role - the two shadows, the eight status borders doing four jobs,
the three mono stacks - each value got its own canonical name and the pair is
recorded for T3.5. Picking a winner between two near-identical greys is a
rendered change, which this task forbids. The console's zebra stripe is the one
that would have bitten: #fafafa is six points from #f4f4f4, and merging them
erases the striping on the nine-column user table.

Collecting the one-offs in one place made two things countable that were not
before: twelve distinct shadows, and a ninth amber (#8a6d00 on the field view,
four points from #8e6a00 and doing the same job - BL-009).

VERIFICATION - the screenshot done-when could not do the job, so it was replaced.

Captured against wave 2, 11 of 14 shots were pixel-identical and 3 were not.
Capturing wave 2 against ITSELF produced the same 3 differences at the same
bounding box, so those shots cannot distinguish a regression from the clock.
Trap 2 in the brief is half wrong: users.html is stable at both widths; the
unstable third is the creator at 1440px, and admin's captured page height varies
by ~600px between runs (BL-012).

So tests/token_check.py was added. It checks what wave 3 actually claims: that
every custom property resolves to the same literal, and every element computes
the same colours, shadows and type. That is stronger than a screenshot - it
covers the hover, focus and disabled rules a screenshot never exercises, and it
is deterministic.

  wave 2 vs T3.2, all 7 pages:
  178/178 wave-2 token names resolve identically, +213 new
  3,500 elements compute identically, zero added, zero removed
  16 tokens differ in notation only (#fff -> #ffffff), which is the duplicate
  class this task existed to collapse

Two detours worth not repeating: the element walk was first keyed by sibling
index and reported 55 phantom differences on the SOP page, where three
JS-injected overlays append in whichever order their async work finishes
(BL-011); and the comparator now normalises notation before reporting, because
otherwise it fails on its own success.

f_items 5 FIXED / F6 REPRODUCES as expected. browser_check 71/71.

ONE DONE-WHEN NOT MET, recorded rather than skipped: "no page stylesheet
declares a raw color, spacing or type value". The colour half is met in full.
483 raw spacing values, 281 font-sizes and 65 radii remain inside rules, 492 of
them in the creator. That is arithmetic, not effort: the creator's spacing is
every integer from 1px to 14px, so no token exists that padding:9px 11px maps to
without changing one of the numbers - and this task forbids changing a rendered
value. The two requirements are mutually exclusive. Logged as BL-010 for T5.x
and T7.1, where those pages are re-laid-out and the values get chosen again.

New backlog: BL-009 (ninth amber), BL-010 (raw spacing/type in rules),
BL-011 (overlay append race), BL-012 (unstable screenshot targets).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

html/login.html

@@ -61,7 +61,7 @@
     button:disabled { background: var(--cds-disabled-02); cursor: not-allowed; }
     .error {
       display: none;
-      background: #fff1f1;
+      background: var(--wp-status-error-bg);
       border-left: 3px solid var(--cds-support-error);
       color: var(--cds-text-error);
       padding: 0.75rem;
@@ -72,9 +72,9 @@
     .foot { margin-top: 1.5rem; font-size: 0.75rem; color: var(--cds-text-helper); text-align: center; }
     .ok {
       display: none;
-      background: #defbe6;
+      background: var(--wp-status-success-bg);
       border-left: 3px solid var(--cds-support-success);
-      color: #0e6027;
+      color: var(--wp-hover-success);
       padding: 0.75rem;
       font-size: 0.8125rem;
       margin-bottom: 1.25rem;