v0.3 Phase 4l: semantic palette revision — Tiger Flame / Banana Cream / Sea Green / Steel Azure

Wren palette pass on 2026/05/15. Splits the role tokens away from
the prior bright/neon set toward a more grounded warm-and-cool
quartet, with explicit FILL + TEXT (signal + ink) pairs in light
mode so AA-on-cream stays cheap to consume.

Dark mode signals
  --color-info-signal     #6EA8FF  →  #064789  Steel Azure
  --color-danger-signal   #FF5A52  →  #F26430  Tiger Flame
  --color-success-signal  #00FF56  →  #519872  Sea Green
  --color-caution-signal  #FFCD00  →  #FCEC52  Banana Cream

Light mode (FILL = signal, TEXT = ink)
  --color-info-signal     #000AFF  →  #217AD5  +ink #1F73C9
  --color-danger-signal   #FF0700  →  #D55121  +ink #C54B1F
  --color-success-signal  #00D94A  →  #21D575  +ink #148348
  --color-caution-signal  #FFCD00  →  #D5A021  +ink #7E7414

Unchanged on purpose
  --color-bg              Coffee Bean #1F0812 was tried live and
                          rejected — R/G/B channels (31/8/18) read
                          as aubergine, not brown. Bg + grain held
                          at #12100E / 0.06 pending a true warm-brown
                          candidate.
  --color-*-border        Hue family unchanged from Phase 4j.
  --color-*-bg            Hand-tuned surface tints unchanged.
  HC variants             Out of scope for this pass.

Known issue
  Steel Azure #064789 on the dark bg sits around 2.06:1 — fails AA
  as text/icon. The role-token model has --color-info-ink (currently
  #9CC6FF, light blue) for that use case, but consumers reaching for
  --color-info-signal directly will read muddy. Retune of the info
  ink/signal split is owed separately. Documented inline.

npm run check: 0 errors.

src/design-system/v0.3-quietware-tokens.css

@@ -186,6 +186,16 @@
    Quietware — dark mode default. Warm brown-charcoal atmosphere.
    ============================================================ */
 :root[data-design="quietware"] {
+  /* Phase 4l — Wren palette revision, 2026/05/15. Role signals
+     swapped to Tiger Flame / Banana Cream / Sea Green / Steel Azure
+     (dark) and the FILL/TEXT pair set (light). Coffee Bean bg
+     candidate #1F0812 was tested live and rejected — its R/G/B
+     channels (31/8/18) sit on a purple-leaning hue, reading as
+     aubergine in the running window, not the labelled warm brown.
+     Bg + grain held at the prior values pending a true coffee-brown
+     candidate. Steel Azure contrast on dark fails AA (see notice on
+     --color-info-signal below) regardless of bg choice — retune of
+     the info ink/signal split is owed separately. */
   --color-bg: #12100E;
   --color-bg-elevated: #1A1713;
   --color-bg-card: #211D18;
@@ -207,25 +217,28 @@
   --color-accent-subtle: color-mix(in srgb, var(--blue-700) 12%, transparent);
   --color-accent-glow:   color-mix(in srgb, var(--blue-700) 25%, transparent);
 
-  /* Four-tier role tokens. Signal stays bright (the role's identity);
+  /* Four-tier role tokens. Signal carries the role's identity
-     ink lightens for text legibility on dark; border is a middle value;
+     (Tiger Flame / Banana Cream / Sea Green / Steel Azure under
-     bg is a hand-tuned dark tint, not a color-mix derivation. */
+     Phase 4l); ink lightens for text legibility on dark; border is
-  --color-info-signal:    #6EA8FF;
+     a middle value; bg is a hand-tuned dark tint, not a color-mix.
+     Borders + bg tints retained from Phase 4j — they go with the
+     hue family rather than the specific shade. */
+  --color-info-signal:    #064789;
   --color-info-ink:       #9CC6FF;
   --color-info-border:    #4D8DFF;
   --color-info-bg:        #101A2A;
 
-  --color-danger-signal:  #FF5A52;
+  --color-danger-signal:  #F26430;
   --color-danger-ink:     #FF9B96;
   --color-danger-border:  #FF5A52;
   --color-danger-bg:      #2A1412;
 
-  --color-success-signal: #00FF56;
+  --color-success-signal: #519872;
   --color-success-ink:    #7DFFA8;
   --color-success-border: #00D94A;
   --color-success-bg:     #0D2415;
 
-  --color-caution-signal: #FFCD00;
+  --color-caution-signal: #FCEC52;
   --color-caution-ink:    #FFE066;
   --color-caution-border: #FFCD00;
   --color-caution-bg:     #29210A;
@@ -419,25 +432,28 @@
   --color-accent-subtle: color-mix(in srgb, var(--blue-700) 12%, transparent);
   --color-accent-glow:   color-mix(in srgb, var(--blue-700) 25%, transparent);
 
-  /* Four-tier role tokens, light mode. Bg values hand-picked as
+  /* Four-tier role tokens, light mode. Phase 4l — Wren palette
-     clean pale tints, not muddy color-mix products. */
+     revision 2026/05/15. Signal = FILL (vivid), ink = TEXT-safe
-  --color-info-signal:    #000AFF;
+     darker sibling that passes 4.5:1 on cream. Saturation/lightness
-  --color-info-ink:       #0033A0;
+     targeted on the locked Banana Cream anchor #D5A021 (S 73%, L 48%).
+     Borders + bg tints unchanged — they go with the hue family. */
+  --color-info-signal:    #217AD5;
+  --color-info-ink:       #1F73C9;
   --color-info-border:    #3A6BFF;
   --color-info-bg:        #EEF3FF;
 
-  --color-danger-signal:  #FF0700;
+  --color-danger-signal:  #D55121;
-  --color-danger-ink:     #B3261E;
+  --color-danger-ink:     #C54B1F;
   --color-danger-border:  #E13A32;
   --color-danger-bg:      #FFF0EF;
 
-  --color-success-signal: #00D94A;
+  --color-success-signal: #21D575;
-  --color-success-ink:    #006B2D;
+  --color-success-ink:    #148348;
   --color-success-border: #159947;
   --color-success-bg:     #EAF8EE;
 
-  --color-caution-signal: #FFCD00;
+  --color-caution-signal: #D5A021;
-  --color-caution-ink:    #7A5D00;
+  --color-caution-ink:    #7E7414;
   --color-caution-border: #D9A900;
   --color-caution-bg:     #FFF7D6;