Harden ACP transport, MCP server, and add permission dialog
- Extract mapUpdate to testable module, dynamic import for @tauri-apps/plugin-shell
- Add warnings for unhandled ACP content types and empty tool titles
- MCP server: session limit (max 10), fix null WS comparison, guard JSX preprocessing
- MCP server: read version from package.json instead of hardcoded 0.0.0
- MCP tests: use port 0 (OS-assigned) to prevent collision
- Connection error handling with user-friendly messages, stale session recovery
- Agent crash detection via close handler, destroying flag, buildCrashChunks
- Port collision: detect EADDRINUSE in vite-plugin stderr and log clear error
- Production Tauri: spawn openpencil-mcp via shell plugin, orphan reuse via health check
- Permission confirmation dialog (reka-ui AlertDialog) with queue, 60s auto-reject timeout
- Health check in ProviderSelect hides ACP agents when MCP server unavailable
- Move DESIGN_CONTEXT to app constants, add ACP_PERMISSION_TIMEOUT_MS
- 36 tests across 3 files (acp-transport, acp-permission, mcp-server)
- Update CHANGELOG, README, CONTRIBUTING, AGENTS.md
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