refactor: enhance artifact system, security, and terminal command handling

- Add basic HTTP authentication (express-basic-auth)
- Improve artifact tool with better source type handling (command_output, file, text)
- Update agent prompt with clearer artifact usage patterns
- Refactor tmux command execution to use execFile for safer argument handling
- Add UI cancellation capability for in-progress operations
- Switch session dumps to use util.inspect for better formatting
- Update artifact tool schema to require title parameter first

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

packages/voice-assistant/agent-prompt.md

@@ -411,16 +411,38 @@ You: create-terminal(name="authentication", workingDirectory="WHATEVER THE CURRE
 
 **When user says "show me", keep your voice response SHORT and use present_artifact for the actual data.**
 
-**Pattern:**
+**CRITICAL: Use command_output or file sources - don't run commands yourself then pass as text.**
+
+**Pattern for commands:**
+
+User: "Show me the git diff"
+You: "Here's the diff."
+[Call present_artifact with source: { type: "command_output", command: "git diff" }]
+
+User: "Show me package.json"
+You: "Here's package.json."
+[Call present_artifact with source: { type: "file", path: "/path/to/package.json" }]
+
+**Only use text source for data you already have (like terminal output you just captured):**
 
 User: "Show me the terminal output"
-You: [Capture terminal output]
+You: [Capture terminal output via capture-terminal]
 You: "Here's the terminal output."
-[Call present_artifact with the output]
+[Call present_artifact with source: { type: "text", text: capturedOutput }]
 
-User: "Show me the inbox items"
-You: "Here's the inbox."
-[Call present_artifact with the items]
+**Bad pattern (don't do this):**
+
+User: "Show me the git diff"
+You: [Run git diff command via send-text]
+You: [Capture output]
+You: [Call present_artifact with text source containing the output]
+❌ Wrong - should use command_output source instead
+
+**Good pattern:**
+
+User: "Show me the git diff"
+You: [Call present_artifact with command_output source: "git diff"]
+✅ Correct - let the tool run the command
 
 **Don't read long content out loud - present it visually instead.**