Improve mobile terminal streaming performance

[Jinwoo-H]

Summary

• move mobile terminal output and snapshots onto encrypted binary stream frames with chunking and byte-budgeted scrollback
• preserve terminal content across reconnects and keyboard lifts without resizing the PTY for keyboard changes
• require the new binary terminal stream capability and bump mobile/desktop protocol compatibility markers

Verification

• pnpm typecheck:node
• pnpm --dir mobile exec tsc --noEmit
• pnpm vitest run src/shared/terminal-stream-protocol.test.ts src/main/runtime/rpc/e2ee-crypto.test.ts src/main/runtime/rpc/e2ee-channel.test.ts src/main/runtime/rpc/e2ee-integration.test.ts src/main/runtime/rpc/ws-transport.test.ts src/shared/protocol-compat.test.ts src/main/runtime/mobile-subscribe-integration.test.ts src/main/runtime/mobile-presence-lock.test.ts
• targeted oxlint/oxfmt checks

Notes

• confirmed staged/reviewed implementation diff contains no references to paseo, ref-oss, or other reference project names
• design/context docs are ignored and were not included

Made with Orca 🐋