fix(ai,coding-agent): make pi-ai browser-safe and move OAuth runtime exports

- add browser smoke bundling check to root check + pre-commit

- lazy-load Bedrock provider registration to avoid browser graph traversal

- remove top-level OAuth runtime exports from @mariozechner/pi-ai

- add @mariozechner/pi-ai/oauth subpath export and update coding-agent imports

- move proxy dispatcher init to coding-agent CLI (Node-only)

- document Bedrock/OAuth browser limitations

closes #1814

packages/coding-agent/package.json

@@ -56,6 +56,7 @@
 		"minimatch": "^10.2.3",
 		"proper-lockfile": "^4.1.2",
 		"strip-ansi": "^7.1.0",
+		"undici": "^7.19.1",
 		"yaml": "^2.8.2"
 	},
 	"overrides": {