Add smart output summarization to reduce token usage and improve performance:

Features:
• Configurable output summarization (enabled by default)
• Shows first and last N lines of long outputs with clear truncation indicators
• Character limit protection to prevent excessive token usage
• Preserves important context while reducing size
• Detailed metadata about summarization applied

Parameters:
• summarize_output: Enable/disable summarization (default: True)
• max_output_lines: Lines to show from start/end (default: 5)
• max_output_chars: Character limit per output (default: 1000)

Benefits:
• Reduces MCP client and LLM token burden
• Maintains readability with clear truncation indicators
• Provides size reduction statistics
• Preserves command execution context
• Option to get full output when needed

Example output includes summarization metadata showing original vs reduced size,
helping users understand the optimization applied.

Signed-off-by: Seokho Son <shsongist@gmail.com>