chore: add changeset for debug mode feature

Author: jpr5

.changeset/debug-mode.md

@@ -0,0 +1,10 @@
+---
+"@copilotkit/shared": minor
+"@copilotkit/runtime": minor
+"@copilotkit/react-core": minor
+"@copilotkit/core": minor
+---
+
+feat: add debug mode to runtime and client
+
+Add `debug` option to `CopilotRuntime` constructor and `<CopilotKit>` provider for detailed event pipeline logging. Server-side uses Pino structured logger; client-side passes config through to AG-UI transport. Accepts `true` for default output or a granular config: `{ events, lifecycle, verbose }`.