feat(website): add @btravstack/entity to the stack

entity is published (0.3.0) with its docs live, so it joins the landing as the
fourth panel. It sits second, after unthrown and before the two contract
packages: the row now reads as the stack does — errors, the domain built on
them, then the transports that carry it.

Its mark is entity's own docs logo, copied under logos/entity-{light,dark}.svg,
which is the same convention the other three follow (verified: the unthrown
pair is byte-identical to unthrown/docs/public/logo-*.svg).

New --pkg-entity token, amber #C8871F: amber encases and preserves — a thing
suspended intact, permanently — which is sealed construction and immutable
data. 6.32 on the dark card, 5.61 as darkened text on white (AA). It replaces
--bt-pink-soft, the org accent, which entity's docs were borrowing;
btravstack/entity#47 moves that half.

The hero count and the footer link lists derive from the array, so only the
section heading and lead needed the three-to-four edit.

Author: btravers

.changeset/entity-accent-token.md

@@ -0,0 +1,10 @@
+---
+"@btravstack/theme": minor
+---
+
+Add `--pkg-entity`, amber `#C8871F`, for `@btravstack/entity`.
+
+Amber encases and preserves — a thing suspended intact, permanently — which is
+sealed construction and immutable data. entity's docs previously used
+`--bt-pink-soft`, the org accent, which the multi-accent rule reserves for org
+chrome.

apps/website/.vitepress/theme/Landing.vue

@@ -44,8 +44,8 @@ interface Project {
   docs: string;
 }
 
-// unthrown leads: it's the base the two contract packages build on, and the
-// most versatile of the three.
+// Ordered as the stack reads — errors, the domain built on them, then the
+// transports that carry it. unthrown leads: the other three build on it.
 const projects: Project[] = [
   {
     key: "unthrown", tag: "Errors", name: "unthrown", pkg: "unthrown", npm: "unthrown",
@@ -55,6 +55,14 @@ const projects: Project[] = [
     install: "pnpm add unthrown",
     repo: "https://github.com/btravstack/unthrown", docs: "https://btravstack.github.io/unthrown/",
   },
+  {
+    key: "entity", tag: "Domain", name: "entity", pkg: "@btravstack/entity", npm: "@btravstack/entity",
+    logo: "/logos/entity", repoFull: "btravstack/entity", stars0: 3,
+    blurb: "Domain entities declared once. One field map gives you a type, four request/response schemas, behaviour, and a class that is itself a zod schema — so entities nest inside each other without losing what makes them entities.",
+    points: ["Branded fields and immutable data", "Sealed construction, enforced invariants", "Result instead of throws"],
+    install: "pnpm add @btravstack/entity",
+    repo: "https://github.com/btravstack/entity", docs: "https://btravstack.github.io/entity/",
+  },
   {
     key: "amqp", tag: "Messaging", name: "amqp-contract", pkg: "@amqp-contract/contract", npm: "@amqp-contract/contract",
     logo: "/logos/amqp-contract", repoFull: "btravstack/amqp-contract", stars0: 18,
@@ -73,7 +81,7 @@ const projects: Project[] = [
   },
 ];
 
-/** Every repo shown on the page — the three published packages. */
+/** Every repo shown on the page — the published packages. */
 const allRepos = projects;
 
 const stars = reactive<Record<string, number>>(
@@ -178,8 +186,8 @@ onMounted(() => {
 
     <!-- The stack — each package in its own color -->
     <section id="packages" class="btv-section">
-      <h2 class="btv-h2">Three libraries, one stack.</h2>
-      <p class="btv-section-lead">Errors, messaging and workflows — three focused packages that compose into one coherent backend.</p>
+      <h2 class="btv-h2">Four libraries, one stack.</h2>
+      <p class="btv-section-lead">Errors, domain, messaging and workflows — four focused packages that compose into one coherent backend.</p>
       <div class="btv-panels">
         <article v-for="p in projects" :key="p.name" class="btv-panel" :style="{ '--pkg': `var(--pkg-${p.key})` }">
           <div class="btv-panel-top">

apps/website/public/logos/entity-dark.svg

@@ -9,7 +9,7 @@ grow.
 *colorful stack of distinct tools* on a near-neutral black canvas: the
 beetroot pink is the ORG accent (wordmark, links, CTAs, mascot), while each
 package glows in **its own accent** — amqp orange, temporal indigo, unthrown
-teal. Weight-contrast typography (one grotesque at 400 vs
+teal, entity amber. Weight-contrast typography (one grotesque at 400 vs
 800), elevation through surface lightness, real numbers in the hero, and the
 gradient beetroot mascot as the one character moment.
 
@@ -55,6 +55,7 @@ atmospheric (studied register — dark, quiet, confident; no blooms).
 | `--pkg-amqp` | `#FF6600` | darken 30% at point of use |
 | `--pkg-temporal` | `#6B76F2` | darken 30% at point of use |
 | `--pkg-unthrown` | `#3FB0A5` | darken 30% at point of use |
+| `--pkg-entity` | `#C8871F` | darken 30% at point of use |
 
 **The multi-accent rule (the studied signature).** The canvas and chrome are
 near-neutral; color belongs to the *products*. Package names, category dots
@@ -149,6 +150,7 @@ The canonical export lives at `packages/theme/src/tokens.css` (published as
   --pkg-amqp:      #FF6600;
   --pkg-temporal:  #6B76F2;
   --pkg-unthrown:  #3FB0A5;
+  --pkg-entity:    #C8871F;
   --font-display:  "Geist", sans-serif; /* 800 for display */
   --font-body:     "Geist", sans-serif;
   --font-mono:     "JetBrains Mono", monospace;

apps/website/public/logos/entity-light.svg

@@ -14,7 +14,7 @@
  * glows in ITS OWN accent — the org reads as a colorful stack of distinct
  * tools, not a monochrome brand. The beetroot pink is the ORG accent
  * (wordmark, links, org CTAs); the per-package accents (amqp orange,
- * temporal indigo, unthrown teal) carry the packages.
+ * temporal indigo, unthrown teal, entity amber) carry the packages.
  * Elevation through lightness, weight-contrast typography, real numbers.
  *
  * DARK is the canonical default. The light scheme overrides the semantic
@@ -43,6 +43,7 @@
   --pkg-amqp:     #FF6600;   /* RabbitMQ's orange */
   --pkg-temporal: #6B76F2;   /* Temporal's indigo */
   --pkg-unthrown: #3FB0A5;   /* outside the signal register: not a signal, a value */
+  --pkg-entity:   #C8871F;   /* amber encases and preserves: sealed, immutable */
 
   /* ── Surfaces (DARK scheme — canonical: near-neutral black) ──── */
   --bg:        oklch(13% 0.006 310);   /* ≈ #080709 — the canvas */