feat(sagi): flesh out mood animations and add avatar interaction motion

Gives watching/thinking real animations (previously static), adds
character to happy/worried/stuck moods, and adds mount-in/press/error-pulse
motion to the avatar button - all gated by prefers-reduced-motion.

fix(test): pin NODE_ENV=production in client-dist-override.test.js

The suite exercises server/index.js's production-only static-serving
gate but never set NODE_ENV itself, so it silently depended on the
ambient shell's NODE_ENV - failing whenever that wasn't "production".

client/src/components/Sagi/sagi.css

@@ -40,7 +40,7 @@
   display: block;
 }
 
-/* ── watching ── (alert, tail/ear motion handled below via whole-mascot transform) */
+/* ── watching ── (attentive sway handled below via whole-mascot transform) */
 
 /* ── worried ── (whole-mascot shake handled below) */
 
@@ -49,7 +49,7 @@
   display: block;
 }
 
-/* ── thinking ── head tilt handled below */
+/* ── thinking ── head-tilt rock handled below */
 
 /* ── sleeping / disconnected ── (eyes shut via static scaleY, no cursor tracking) */
 .sagi-avatar[data-mood="sleeping"] .sagi-eye-blink,
@@ -95,22 +95,34 @@
 @keyframes sagi-shake {
   0%,
   100% {
-    transform: translateX(0);
+    transform: translateX(0) scale(1);
   }
-  25% {
-    transform: translateX(-2px);
+  20% {
+    transform: translateX(-3px) scale(1.01);
   }
-  75% {
-    transform: translateX(2px);
+  40% {
+    transform: translateX(3px) scale(0.99);
+  }
+  60% {
+    transform: translateX(-2px) scale(1.01);
+  }
+  80% {
+    transform: translateX(2px) scale(1);
   }
 }
 @keyframes sagi-bob {
   0%,
   100% {
-    transform: translateY(0);
+    transform: translateY(0) rotate(0deg);
+  }
+  25% {
+    transform: translateY(-4px) rotate(-4deg);
   }
   50% {
-    transform: translateY(-3px);
+    transform: translateY(-6px) rotate(0deg);
+  }
+  75% {
+    transform: translateY(-4px) rotate(4deg);
   }
 }
 @keyframes sagi-sparkle-twinkle {
@@ -124,6 +136,55 @@
     opacity: 1;
   }
 }
+@keyframes sagi-sway {
+  0%,
+  100% {
+    transform: rotate(0deg);
+  }
+  25% {
+    transform: rotate(-2.5deg);
+  }
+  75% {
+    transform: rotate(2.5deg);
+  }
+}
+@keyframes sagi-rock {
+  0%,
+  100% {
+    transform: rotate(-6deg);
+  }
+  50% {
+    transform: rotate(-11deg);
+  }
+}
+@keyframes sagi-droop {
+  0%,
+  100% {
+    transform: scale(1) translateY(0);
+  }
+  50% {
+    transform: scale(0.985) translateY(2px);
+  }
+}
+@keyframes sagi-enter {
+  from {
+    opacity: 0;
+    transform: scale(0.6) translateY(12px);
+  }
+  to {
+    opacity: 1;
+    transform: scale(1) translateY(0);
+  }
+}
+@keyframes sagi-error-pulse {
+  0%,
+  100% {
+    transform: scale(1);
+  }
+  50% {
+    transform: scale(1.15);
+  }
+}
 
 /* idle: gentle breathing + occasional blink */
 .sagi-avatar[data-mood="idle"] {
@@ -145,19 +206,24 @@
   animation: sagi-sparkle-twinkle 0.9s ease-in-out infinite;
   transform-origin: 1073px 424px;
 }
-/* worried: shake */
+/* worried: alarmed shake */
 .sagi-avatar[data-mood="worried"] {
   animation: sagi-shake 0.35s ease-in-out 0s 3;
   transform-origin: 640px 720px;
 }
-/* stuck: slow breathe */
+/* stuck: slow, drooping breathe (fatigued) */
 .sagi-avatar[data-mood="stuck"] {
-  animation: sagi-breathe 2.4s ease-in-out infinite;
+  animation: sagi-droop 2.4s ease-in-out infinite;
   transform-origin: 640px 720px;
 }
-/* thinking: subtle head tilt */
+/* thinking: rocking head tilt */
 .sagi-avatar[data-mood="thinking"] {
-  transform: rotate(-6deg);
+  animation: sagi-rock 1.8s ease-in-out infinite;
+  transform-origin: 640px 720px;
+}
+/* watching: attentive sway while a session is live */
+.sagi-avatar[data-mood="watching"] {
+  animation: sagi-sway 3.2s ease-in-out infinite;
   transform-origin: 640px 720px;
 }
 /* sleeping: slow breathe, droop */
@@ -176,6 +242,10 @@
   .sagi-avatar * {
     animation: none !important;
   }
+  .sagi-avatar-btn,
+  .sagi-error-dot {
+    animation: none !important;
+  }
 }
 
 /* ════════ shell (avatar button, bubble, panel) ════════ */
@@ -197,10 +267,14 @@
     left 0.28s cubic-bezier(0.22, 1, 0.36, 1),
     top 0.28s cubic-bezier(0.22, 1, 0.36, 1),
     transform 0.15s ease;
+  animation: sagi-enter 0.4s cubic-bezier(0.22, 1, 0.36, 1);
 }
 .sagi-avatar-btn:hover {
   transform: scale(1.06);
 }
+.sagi-avatar-btn:active {
+  transform: scale(0.94);
+}
 .sagi-avatar-btn:focus-visible {
   outline: 2px solid #818cf8;
   outline-offset: 3px;
@@ -241,6 +315,7 @@
   align-items: center;
   justify-content: center;
   border: 2px solid #0c0c14;
+  animation: sagi-error-pulse 1.2s ease-in-out infinite;
 }
 .sagi-bubble {
   max-width: 16rem;

server/__tests__/client-dist-override.test.js

@@ -21,7 +21,12 @@ fs.mkdirSync(DIST);
 fs.writeFileSync(path.join(DIST, "index.html"), "<!doctype html><title>from-runtime</title>");
 
 // Must be set BEFORE requiring the server: the data dir, discovery file and
-// the static mount are all resolved at startup.
+// the static mount are all resolved at startup. NODE_ENV=production is the
+// gate server/index.js uses to decide whether to serve the client bundle at
+// all - this suite exercises exactly that code path, so it cannot rely on
+// whatever NODE_ENV the ambient shell happens to have.
+const PREV_NODE_ENV = process.env.NODE_ENV;
+process.env.NODE_ENV = "production";
 process.env.CLAUDE_HOME = TMP;
 process.env.DASHBOARD_DB_PATH = path.join(TMP, "test.db");
 process.env.DASHBOARD_LIVENESS_PROBE = "0";
@@ -81,6 +86,7 @@ describe("DASHBOARD_CLIENT_DIST pointing at a missing directory", () => {
 
   after(() => {
     if (srv) srv.close();
+    process.env.NODE_ENV = PREV_NODE_ENV;
   });
 
   it("answers the API and only 404s the UI route", async () => {