feat(patterns): add kanban task-management plugin (YYLO Ledger skill)

[InsightFactoryAPP]

Summary

Adds a new Pattern plugin: kanban — Kanban task and dependency management for AI coding agents, powered by the YYLO Ledger CLI (yy ledger / yylo-ledger).

Changes

• New plugin plugins/patterns/kanban/ following the skills-only pattern-plugin shape (oop, functional-programming): .claude-plugin/plugin.json, README.md, CHANGELOG.md, and one skill.
• skills/kanban-task-management/ vendored from yylo-dev/yylo-skills (MIT): universal Record retrieval by ID, task/dependency operations, PDR and artifact discovery, source-of-truth boundaries.
• .claude-plugin/marketplace.json: one new entry (alphabetical position in the primary block), category: "Pattern".

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• New plugin

Plugin Changes

Plugin category:

• Tool - Development tools and utilities
• Framework - Framework-specific skills
• Language - Language-specific skills
• Validation - Linting and validation hooks
• Discipline - Specialized agents with domain expertise
• Integration - MCP servers for external services
• Pattern - Methodologies and workflows
• Core - Han CLI or core infrastructure
• N/A - Not a plugin change

Validation:

• claude plugin validate . passes
• Hooks tested in Claude Code session (if applicable) (N/A — skills-only plugin, no hooks)

Testing

• Tests pass (cd packages/han && bun test) (not touched — no changes outside plugins/patterns/kanban/ and the marketplace manifest)
• Linting passes (markdown/json follow existing patterns; no repo lint run in this environment)
• Manual testing performed (the vendored skill is in daily production use with the YYLO Ledger CLI)

Checklist

• Code follows existing patterns
• Self-review completed
• Documentation updated (if needed)
• No new warnings

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🤖 Disclosure: this contribution was prepared with AI-agent assistance (Claude Code) on behalf of the YYLO project, following the repository's CONTRIBUTING guidelines. The vendored skill is MIT-licensed from yylo-dev/yylo-skills; human maintainers review and approve all content upstream.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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