fix(themes): P1 palette retunes from the design audit + gated subtext floor (item 28b)

The audit's P1s, fixed at the palette level (items 25/27 previously
patched the consumers around these):
- summer-day: surface was the TEXT color (slate #5c6a72 on cream) and
  subtext was the BASE (ratio 1.0, invisible) — now a raised cream
  surface #efe7d0 and a slate-teal subtext #6e828a in the theme's
  family.
- flexoki-light: surface/overlay/muted were all the text black and
  subtext the paper — retuned to canonical upstream Flexoki tones
  (ui #E6E4D9, #B7B5AC, tx-2 #6F6E69, base-500 #878580).
- miasma: pure-black surface under a #222 base → raised #2e2e2e.
- kanagawa: surface was sumiInk0 (darker than the bg) → upstream's
  raised sumiInk4 #2a2a37.
check-theme-contrast.py gains the adopted rule: subtext on base >= 3.0
(all 21 themes pass), so the invisible-secondary-text class cannot
ship again. Model note in the backlog: `overlay` is a mid-tone role
(catppuccin semantics), not a third bg tier.

Verified: V0 + checks.theme-contrast green (21x3); re-audit shows all
four P1 findings gone; a scratch downstream with summer-day active
builds and the new surface hex lands in the rendered ghostty config.
Remains: V3 four-theme eyeball (HARDWARE-QUEUE) and 28b's P2 floors +
exemption list.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

agent/JOURNAL.md

@@ -17,6 +17,26 @@ Template:
 
 ---
 
+## 2026-07-05 — P1 palette retunes + gated subtext floor (iteration #32, item 28b)
+- **Task:** item 28 slice (b), P1s from the #31 audit.
+- **Did:** summer-day: surface #5c6a72(=text!)→#efe7d0 raised cream,
+  subtext #fdf6e3(=base!)→#6e828a slate; flexoki-light to canonical
+  Flexoki tones: surface #E6E4D9(ui), overlay #B7B5AC, subtext
+  #6F6E69(tx-2), muted #878580(base-500); miasma surface #000→#2e2e2e;
+  kanagawa surface #090618→#2a2a37 (upstream sumiInk4 — old value was
+  sumiInk0, darker than bg). check-theme-contrast.py gains the adopted
+  `subtext/base ≥ 3` pairing (the item-25/27 trap, now impossible).
+  Model note recorded: `overlay` is a mid-tone role, not a bg tier.
+- **Verified:** V0 + checks.theme-contrast GREEN (21×3 pairings);
+  re-audit: all four P1 findings gone (kanagawa now CVD-only findings);
+  V1 — scratch downstream with summer-day ACTIVE builds, new surface
+  hex present in rendered ghostty config. Looks are V3 → queued
+  (four-theme eyeball).
+- **Pending:** 28b remainder: P2 floors (muted ≥2, warn ≥2.5,
+  text-on-surface ≥4.5, accentAlt ≥3) + exemption-list mechanism.
+- **Next suggestion:** 28b P2s (7 muted retunes + 4 warn + 2
+  text-on-surface + 2 accentAlt, then gate with exemptions).
+
 ## 2026-07-05 — theme design audit (iteration #31, item 28 slice a)
 - **Task:** BACKLOG NEXT#28 slice (a) — the design-theory audit
   (human-requested; Bernardo asked to run it now).