fix: improve CLI text output formatting

[julianschiavo]

• improve xcdocs search output with bold headings, labeled metadata, and index-based indentation
• align xcdocs get output with the same renderer without leading indentation
• add regression tests for styled search and get text output

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Note

Low Risk
Low risk: changes are limited to CLI text formatting (ANSI styling/indentation) and add regression tests; no changes to search/get data fetching or JSON output paths.

Overview
Improves xcdocs text output by replacing the ad-hoc search/get printing with a shared renderTextEntry renderer that adds labeled metadata (Kind, Relevance, ID), consistent spacing/blank lines, and index-based indentation for aligned multi-line results.

Adds conditional ANSI bold styling when the terminal supports it (or when CLICOLOR_FORCE=1, respecting NO_COLOR/TTY/TERM=dumb) and introduces regression tests covering styled search output, double-digit index alignment, and get output without leading indentation.

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