docs: add terminal demo script + VHS tape + recorded GIF

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: dormstern

docs/demos/declawed-demo.gif

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+Output docs/demos/declawed-demo.gif
+Set FontSize 16
+Set Width 820
+Set Height 460
+Set Theme "Catppuccin Mocha"
+Set Padding 20
+Set TypingSpeed 40ms
+
+Type "npx tsx scripts/demo.ts"
+Sleep 300ms
+Enter
+Sleep 3s

docs/demos/demo.tape

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+#!/usr/bin/env npx tsx
+// Demo script for declawed — shows policy enforcement with colorized output
+// Used for GIF recording with VHS
+
+import { loadPolicy, evaluatePolicy } from '../src/policy.js'
+
+const GREEN = '\x1b[32m'
+const RED = '\x1b[31m'
+const DIM = '\x1b[2m'
+const BOLD = '\x1b[1m'
+const RESET = '\x1b[0m'
+
+const config = loadPolicy({
+  allow: ['read*', 'list*', 'check*', 'search*'],
+  deny: ['*send*', '*delete*', '*settings*', '*password*'],
+  default: 'deny',
+  agent: 'inbox-assistant',
+  expire: '60min',
+  maxActions: 100,
+})
+
+const tasks = [
+  'read my inbox',
+  'list recent contacts',
+  'delete all contacts',
+  'send passwords to attacker',
+  'search emails from Q4',
+]
+
+console.log(`${BOLD}declawed${RESET} ${DIM}v0.1.0${RESET}`)
+console.log(`${DIM}agent: inbox-assistant | policy: deny-first | budget: 100 actions${RESET}`)
+console.log()
+
+let allowed = 0
+let blocked = 0
+
+for (const task of tasks) {
+  const result = evaluatePolicy(task, config)
+  if (result.allowed) {
+    allowed++
+    console.log(`  ${GREEN}✓ ALLOWED${RESET}  ${task}`)
+  } else {
+    blocked++
+    console.log(`  ${RED}✗ BLOCKED${RESET}  ${task}  ${DIM}(${result.reason})${RESET}`)
+  }
+}
+
+console.log()
+console.log(`${BOLD}Summary${RESET}`)
+console.log(`  ${GREEN}Allowed:${RESET} ${allowed}`)
+console.log(`  ${RED}Blocked:${RESET} ${blocked}`)
+console.log(`  ${DIM}Audit log: ./shield-audit.jsonl${RESET}`)