🤖 Add niceness parameter to executeBash for process priority control

[ammar-agent]

Add optional niceness parameter to the executeBash IPC call for controlling process priority. This parameter is only available at the IPC level and is not exposed to agents in tool descriptions.

Changes

• Add niceness parameter to IPC interface: Added optional niceness parameter to executeBash options (accepts -20 to 19, where lower = higher priority)
• Wire through stack: Parameter flows from IPC → ipcMain handler → bash tool → process spawn
• Bash tool implementation: When niceness is specified, commands are wrapped with nice -n <value>
• Frontend git operations: Set all git-related executeBash calls to use niceness 19 (lowest priority) to prevent background operations from interfering with user interactions
• Auto-dependency installation: Added ensure-deps Makefile target that automatically runs bun install if node_modules doesn't exist

Technical Details

When niceness is provided, the bash tool wraps commands like:

nice -n 19 bash -c "original command"

All git operations in GitStatusContext and GitStatusIndicator now run at lowest priority:

• Git fetch (30s timeout)
• Git status checks (5s timeout)
• Git diff operations (5s timeout)

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