Fix ENOSPC Node.js error by configuring system inotify limits

[Copilot]

This PR addresses the errno: 'ENOSPC' Node.js warning that occurs when development tools exceed the system's file watching limits on Linux systems.

Problem

The ENOSPC (Error No Space) error commonly occurs in Node.js development environments when build tools, file watchers, and development servers try to monitor more files than the system's inotify limits allow. The default fs.inotify.max_user_watches limit is often too low for modern development workflows.

Solution

Added a new system configuration script that:

• Increases inotify limits: Sets fs.inotify.max_user_watches to 524288 (recommended minimum)
• Linux-only: Gracefully skips on macOS and other platforms where inotify doesn't apply
• Persistent configuration: Adds settings to /etc/sysctl.d/99-dotfiles.conf to survive reboots
• Immediate effect: Applies changes right away for the current session
• Conservative approach: Only increases limits if they're currently below the recommended threshold

Changes Made

• script/install.d/01a-system.sh - New system configuration script that runs early in the installation sequence
• tests/test_system_config.py - Comprehensive tests to verify the configuration works correctly

Usage

The script runs automatically as part of the dotfiles installation, or can be executed individually:

script/install system

Example output on Linux:

Current inotify limit: 8192
Setting inotify limit to: 524288
Added inotify configuration to /etc/sysctl.d/99-dotfiles.conf
New inotify limit: 524288

Fixes #6.

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