docs: demo GIF with live API curl — 40s, 5 clean scenes

Scenes: open → fuzzy find → ripgrep → curl running API (JSON) → cheat sheet.
Server runs in background, curl shows formatted /users response.
Fixed: port conflict, buffer state reset before cheat sheet.

.github/demo.tape

@@ -1,6 +1,6 @@
-# chopsticks demo — narrative: "what can I do with this?"
+# chopsticks demo — "what can I do with this?"
 # Rule: NEVER use Escape to close FZF — always Enter (deterministic).
-# Pacing: each scene holds long enough for a viewer to read and understand.
+# Pacing: hold each scene long enough for the viewer to read.
 
 Output .github/demo.gif
 Set Shell bash
@@ -11,10 +11,15 @@ Set Theme "Builtin Solarized Dark"
 Set TypingSpeed 50ms
 Set Padding 10
 
-# ── 1. Open file — syntax highlighting + statusline ────────────────────────
+# ── 0. Start API server in background ──────────────────────────────────────
 Type "cd /tmp/demo-project"
 Enter
-Sleep 0.8s
+Sleep 0.5s
+Type "python3 serve.py > /dev/null 2>&1 &"
+Enter
+Sleep 1s
+
+# ── 1. Open file — syntax highlighting + statusline ────────────────────────
 Type "vim server.py"
 Enter
 Sleep 3.5s
@@ -35,16 +40,18 @@ Sleep 3s
 Enter
 Sleep 3s
 
-# ── 4. Run file (,cr) ─────────────────────────────────────────────────────
+# ── 4. Curl the running API from inside Vim ────────────────────────────────
-Type ":edit server.py"
+Type ":!curl -s localhost:8080/users | python3 -m json.tool"
 Enter
-Sleep 1.5s
+Sleep 4.5s
-Type ",cr"
-Sleep 4s
 Enter
 Sleep 1.5s
 
 # ── 5. Cheat sheet (,?) ───────────────────────────────────────────────────
+# Reset to server.py so cheat sheet shows code on left, keys on right.
+Type ":edit server.py"
+Enter
+Sleep 1s
 Type ",?"
 Sleep 5.5s
 Type "q"