refactor: consolidated json parsing and stream utilities

- Centralized JSON parsing and stream processing logic by moving utilities from `packages/ai` to the shared `@oh-my-pi/pi-utils` package.
- Standardized import paths for JSON parsing and streaming across the agent, ai, and coding-agent packages.
- Refactored SSE stream handling to use consolidated `parseStreamingJson` logic and introduced robust error recovery for malformed container-shaped tail events.
- Cleaned up legacy bundled registry references and updated related module exports and tests to reflect the new utility structure.

packages/coding-agent/test/modes/controllers/usage-command.test.ts

@@ -9,12 +9,7 @@ interface RenderableBlock {
 }
 
 function isRenderableBlock(value: unknown): value is RenderableBlock {
-	return (
-		value !== null &&
-		typeof value === "object" &&
-		"render" in value &&
-		typeof value.render === "function"
-	);
+	return value !== null && typeof value === "object" && "render" in value && typeof value.render === "function";
 }
 
 function renderPresentedBlocks(value: unknown): string {