feat: add slim cross transport reference application

[hackeramitkumar]

Summary

Adds slim-cross-transport, a reference demo in agentic-apps that shows SLIM messaging across WebSocket and gRPC on a single dual-transport node. Browser participants use @agntcy/slim-bindings-react-native WASM bindings; native Rust clients join over WebSocket and gRPC.

• Browser UI — multi-session Vite app (moderator + participants, multicast/unicast, optional MLS)
• Bindings integration — links to sibling slim-bindings/react-native (manual WASM build; not on npm yet)
• API alignment — uses the latest Service-based browser API from slim-bindings/react-native/examples/browser (createAndConnectApp, setRouteAsync, service.disconnect, etc.)
• Orchestration — Taskfile.yaml for the SLIM node, four native clients, WASM build, and UI

What’s included

Component	Description
slim-cross-transport/	Browser demo + SLIM node/client configs
src/common.ts	Shared connect/helpers (mirrors browser examples)
src/session-common.ts	Participant roster + polling helpers
configs/	Dual-transport node (:46357 ws, :46358 grpc) + native client configs
scripts/browser-invite-smoke.mjs	Playwright smoke test for browser invite flow

Prerequisites (documented in README)

Sibling checkouts required:

<workspace>/
├── agentic-apps/slim-cross-transport/
├── slim/
└── slim-bindings/react-native/

Bindings must be built locally before running the UI:

cd slim-bindings/react-native && npm install && npm run build:web

Test plan

• Clone agentic-apps, slim, and slim-bindings as siblings
• Build browser WASM: cd slim-bindings/react-native && npm run build:web
• Install demo deps: cd agentic-apps/slim-cross-transport && npm install
• Start SLIM node: task node
• Start native clients: task native:grpc-1, native:grpc-2, native:ws-1, native:ws-2
• Start UI: task ui → open http://127.0.0.1:5173/
• Connect three browser tabs (moderator + 2 participants)
• Create a multicast session inviting browser-b, native-ws-1, native-grpc-1
• Confirm messages reach browser and native terminals
• Optional: run Playwright smoke — node scripts/browser-invite-smoke.mjs (with UI running)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!