feat: add doc-sync plugin for continuous documentation automation

[emma-praxis]

Overview

Implements a continuous documentation synchronization engine inspired by quickstop's Inkwell plugin, designed specifically for Claude Code workflows.

What It Does

Creates a bridge between agent-ready (initial scaffolding) and doc-audit (periodic validation) with automated, queue-based documentation updates triggered by code changes.

Key Features

• Queue-based processing - Non-blocking documentation updates via git hooks
• Agent-ready focus - Documentation formats optimized for AI agent consumption
• Stack-aware presets - 5 preconfigured stacks (TypeScript, Rails, Python, Go, Rust)
• Ecosystem integration - Works with existing agent-ready and doc-audit plugins
• Agent schemas - Auto-documents agent capabilities and tool schemas

Implementation Details

• 13 files, ~1,100 lines of implementation
• PostToolUse + Stop hooks for automatic queue management
• 5 skills for setup, processing, and maintenance
• 2 specialized agents for doc writing and index building
• Version 1.0.0 ready for marketplace

Files Added

Component	Files	Purpose
Core	plugin.json, README.md	Plugin identity and docs
Hooks	hooks.json, 2 shell scripts	Git integration
Agents	doc-writer.md, index-builder.md	Queue processing
Skills	5 skill directories	Setup, capture, process, stale detection
Rules	doc-hygiene.md	Code conventions

Testing

Validated through comprehensive coding session with multiple review cycles and fixes applied.

Closes #[issue-number] (if applicable)