Fix P1 Windows packaging (#69179) and Terminal Deadlock (#69212)

[JonthanaHanh]

This PR addresses two P1 issues identified in the repository audit:

1. Windows Packaging Architecture Enforcement ([Bug]: This app can't run on your computer (此应用无法在你的电脑上运行) NousResearch/hermes-agent#69179):

   • Updates apps/desktop/scripts/stage-native-deps.mjs to explicitly verify that x64 binaries are staged when targeting win32-x64.
   • This prevents silent packaging of host architecture binaries during cross-compilation/packaging flows on Windows.

2. Terminal Compound Background Command Deadlock (fix(gateway): suppress the duplicate clarify tool-progress bubble (#69175) NousResearch/hermes-agent#69212):

   • Updates tools/terminal_tool.py's _rewrite_compound_background function to wrap trailing backgrounded commands in braces: A && B & -> A && { B & }.
   • This ensures Bash doesn't fork the entire compound command into a subshell that waits for a long-running background process, which previously caused terminal tool timeouts and stalls.

Verified the regex and logic for both fixes. Proceeding to P2 remediations next.