fix: replace IPC timeout fallback with renderer handshake

[nat-openclaw]

Summary

• Remove the 15s IPC_READY_TIMEOUT_MS fallback in sendIPCMessage that could dispatch main→renderer IPC before the client was listening
• Gate IPC on a proper handshake: did-finish-load for the main app page plus the existing client-ready-for-events signal from the renderer
• Run onMainAppReady after the renderer handshake completes (normal startup, game launch, and hook-only launch paths)

Closes #165

Test plan

• bun run typecheck in application/
• Manual startup: verify all-addons-started, addon-connected, and addon-runtime-ready reach the frontend reliably
• Manual --game-id and hook-only launch paths still show the main UI and receive startup IPC

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Project	Deployment	Actions	Updated (UTC)
open-game-installer-web	Ready	Preview, Comment	Jun 7, 2026 11:51pm

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