feat: AI skills, Logger service, and graphify knowledge graph

[Adi-ty]

Description

Add AI-assisted development skills for Claude Code and Copilot, a Logger service, and a graphify knowledge graph to enable smarter AI tooling within the theme.

Technical Details

Claude Code Skills (.claude/skills/):

• init/SKILL.md — theme setup and identity management skill (drives npm run init)
• scaffold/SKILL.md + evals/ — TDD-first feature scaffold skill (blocks, shortcodes, settings pages)
• setup/SKILL.md + evals/ — bootstrap skill for a new WordPress plugin/theme from a natural-language description
• README.md — skill index
  GitHub Copilot Prompts & Instructions:
• .github/prompts/init.prompt.md — /init command for Copilot Chat
• .github/prompts/scaffold.prompt.md — /scaffold command for Copilot Chat
• .github/instructions/framework-php.instructions.md — review rules shipped from rtcamp/wp-framework
  Agent Instructions:
• AGENTS.md — tool-agnostic brief covering structure, principles, guardrails, and graph-first querying
• CLAUDE.md — Claude Code memory file with key conventions
  Logger Service (inc/Core/Logger.php):
• Framework-based Registrable class for structured logging
• Registered in Main::CLASSES and tested via tests/php/inc/Core/LoggerTest.php
• Accessor helpers in inc/Helpers/Util.php (log_error, log_info, log_warning)
  Graphify Knowledge Graph:
• scripts/graphify/install.sh, install.ps1, uninstall.sh, verify.sh — cross-platform installer
• scripts/graphify/README.md — setup and usage docs
• docs/knowledge-graph.md — project-specific graph documentation
• graphify-out/graph.json + GRAPH_REPORT.md — committed pre-built graph (16K+ nodes, tree-sitter extracted)
  Init integration:
• bin/init.js extended to sync AI instructions (npm run sync-ai) and install graphify post-init