docs: add asciinema demo recording

Author: jidong

docs/demo-script.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+# ContextZip Demo Recording Script
+# Run: asciinema rec docs/demo.cast -c "bash docs/demo-script.sh"
+
+export CONTEXTZIP_QUIET=1
+export PATH="$HOME/.local/bin:$PATH"
+
+clear
+echo ""
+echo "  ⚡ ContextZip Demo"
+echo "  ─────────────────────"
+echo ""
+sleep 2
+
+# Scene 1: Version
+echo "  $ contextzip --version"
+sleep 0.5
+contextzip --version
+sleep 1.5
+echo ""
+
+# Scene 2: Node.js error compression
+echo "  $ contextzip err node broken-app.js"
+sleep 0.5
+cat << 'EOF' | contextzip err cat
+TypeError: Cannot read properties of undefined (reading 'id')
+    at getUserProfile (/app/src/api/users.ts:47:23)
+    at processAuth (/app/src/middleware/auth.ts:12:5)
+    at Layer.handle (/app/node_modules/express/lib/router/layer.js:95:5)
+    at next (/app/node_modules/express/lib/router/route.js:144:13)
+    at Route.dispatch (/app/node_modules/express/lib/router/route.js:114:3)
+    at Layer.handle (/app/node_modules/express/lib/router/layer.js:95:5)
+    at next (/app/node_modules/express/lib/router/index.js:275:10)
+    at Function.process_params (/app/node_modules/express/lib/router/index.js:331:12)
+    at next (/app/node_modules/express/lib/router/index.js:271:10)
+    at serveStatic (/app/node_modules/serve-static/index.js:75:16)
+EOF
+sleep 2
+echo ""
+
+# Scene 3: git status compression
+echo "  $ contextzip git status"
+sleep 0.5
+contextzip git status
+sleep 2
+echo ""
+
+# Scene 4: gain dashboard
+echo "  $ contextzip gain --by-feature"
+sleep 0.5
+contextzip gain --by-feature 2>&1 | head -20
+sleep 3
+echo ""
+
+echo "  ⚡ Install: npx contextzip"
+echo "  📦 GitHub: github.com/jee599/contextzip"
+echo ""
+sleep 3

docs/demo.cast

@@ -0,0 +1,16 @@
+{"version":3,"term":{"cols":80,"rows":24,"type":"xterm-256color","theme":{"fg":"#ffffff","bg":"#1e1e1e","palette":"#000000:#990000:#00a600:#999900:#0000b3:#b300b3:#00a6b3:#bfbfbf:#666666:#e60000:#00d900:#e6e600:#0000ff:#e600e6:#00e6e6:#e6e6e6"}},"timestamp":1774002368,"command":"bash docs/demo-script.sh","env":{"SHELL":"/bin/zsh"}}
+[0.014, "o", "\u001b[3J\u001b[H\u001b[2J"]
+[0.000, "o", "\r\n"]
+[0.000, "o", "  ⚡ ContextZip Demo\r\n"]
+[0.000, "o", "  ─────────────────────\r\n\r\n"]
+[2.008, "o", "  $ contextzip --version\r\n"]
+[0.510, "o", "docs/demo-script.sh: line 18: contextzip: command not found\r\n"]
+[1.510, "o", "\r\n  $ contextzip err node broken-app.js\r\n"]
+[0.512, "o", "docs/demo-script.sh: line 25: contextzip: command not found\r\n"]
+[2.015, "o", "\r\n  $ contextzip git status\r\n"]
+[0.514, "o", "docs/demo-script.sh: line 44: contextzip: command not found\r\n"]
+[2.007, "o", "\r\n  $ contextzip gain --by-feature\r\n"]
+[0.518, "o", "docs/demo-script.sh: line 51: contextzip: command not found\r\n"]
+[3.008, "o", "\r\n  ⚡ Install: npx contextzip\r\n  📦 GitHub: github.com/jee599/contextzip\r\n"]
+[0.000, "o", "\r\n"]
+[3.011, "x", "0"]