Add ClaudeCodeFormat to unified build system

[thomas-bartlett]

Integrate Claude Code plugin generation into the Python converter architecture. Replaces bash script with ClaudeCodeFormat class that outputs to skills/ while preserving YAML frontmatter. Fixes plugin manifest schema issues (repository field format).

[Copilot]

Pull Request Overview

This PR integrates Claude Code plugin generation into the unified build system by replacing a bash script with a Python-based ClaudeCodeFormat class. The implementation outputs to skills/software-security/rules/ at project root (rather than ide_rules/), preserves YAML frontmatter with security rule metadata, and fixes plugin manifest schema issues by changing the repository field from an object to a string format.

Key Changes

• Added ClaudeCodeFormat class to generate .md files with preserved YAML frontmatter for Claude Code plugins
• Introduced outputs_to_ide_rules() method in base format to support formats outputting to project root vs ide_rules/
• Fixed plugin manifest schema by changing repository field from object format to simple string URL

Reviewed Changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/unified_to_all.py	Registers ClaudeCodeFormat and uses format's output preference for path construction
src/prepare-claude-code-plugin.sh	Removed bash script replaced by Python converter
src/formats/claudecode.py	New ClaudeCodeFormat implementation with YAML frontmatter preservation
src/formats/base.py	Added outputs_to_ide_rules() method for flexible output location
src/formats/init.py	Exports ClaudeCodeFormat in module interface
src/converter.py	Updated FormatOutput to include outputs_to_ide_rules field
skills/software-security/rules/*.md	Added rule_id after frontmatter, removed empty languages arrays
.claude-plugin/plugin.json	Changed repository from object to string format
.claude-plugin/marketplace.json	Moved repository field to plugin level, fixed source path

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[santosomar]

@thomas-bartlett — thanks for fixing and enhancing the elements from #45 ... Looks good!