Increase saving debounce interval (and make it configurable)

[konard]

Summary

This PR implements a configurable debounce delay for watch mode, addressing issue #33.

Changes Made

• Increased default debounce delay from 2 seconds to 5 seconds for better stability
• Added --debounce-delay option to configure the delay in milliseconds
• Updated help text to clarify the difference between debounce (5s) and throttle (30s)
• Added comprehensive test coverage with both unit and integration tests
• Added usage example demonstrating custom debounce delay configuration

Usage

# Use default 5-second debounce delay
claude-profiles --watch work

# Use custom 10-second debounce delay
claude-profiles --watch work --debounce-delay 10000

# Use shorter 1-second debounce delay for rapid changes
claude-profiles --watch work --debounce-delay 1000

Technical Details

• The debounce delay is now configurable via the --debounce-delay option
• Default increased from 2000ms to 5000ms to reduce unnecessary saves
• The option integrates cleanly with existing watch mode functionality
• All existing tests continue to pass
• Added comprehensive test coverage for the new functionality

Test Coverage

• Added test-debounce-delay.sh for basic functionality tests
• Added test-debounce-integration.mjs for integration testing
• Verified existing functionality remains intact
• Tested help output and option validation

Test plan

• Run existing test suite to ensure no regressions
• Test help output includes new option and examples
• Test default behavior uses 5-second debounce
• Test custom debounce delay values work correctly
• Test option validation for numeric values

Fixes #33

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