feat: Enhanced CLI Watcher with automatic terminal process monitoring

[vrubezhny]

CLI Watcher now automatically detects and tracks terminal-based development activity, distinguishing between interactive CLIs (vim, REPLs) and work processes (builds, deploys) without manual configuration.

Key Features:

• Fully automatic: Only requires 'enabled: true' - auto-detects ALL terminal processes
• Smart defaults: Adapts activityWindow and gracePeriod to workspace idle timeout
• Automatic classification: Interactive (vim, python REPL) vs work (builds, deploys)
• Backward compatible: Old configs continue working with deprecation warnings
• Safety mechanisms: Grace period (5min), max age limit (6h), activity monitoring
• Flexible duration parsing: Accepts 6h, 25m, 60 (seconds), or duration strings

Configuration:

• Minimal: enabled: true (that's it!)
• Smart defaults: Auto-calculated from workspace idle timeout
• Time settings: checkPeriod, activityWindow, gracePeriod, maxProcessAge
• Override options: watchedCommands (fix misclassification), ignoredCommands (skip entirely)

Technical Implementation:

• User process filtering: Parent TTY chain analysis (filters shells, system processes)
• Interactive detection: Foreground process group + TTY read analysis
• Activity tracking: TTY access time (Atime) monitoring for user input
• Multicall binary support: Uses /proc/comm for proper command detection
• Self-skip: che-machine-exec doesn't watch itself
• Config validation: Warns about misconfigurations without breaking

Documentation:

• timeout/CLI-WATCHER.md - Comprehensive guide with testing scenarios
• timeout/.noidle.minimal - Minimal config example
• timeout/.noidle.example - Full config with all options

Issue: https://redhat.atlassian.net/browse/CRW-11505