chore(repo): register the shadcn skill and mcp integration (#212)

[w7-mgfcode]

Summary

Resolves #212. Registers the shadcn skill + shadcn MCP server integration in the repo's policy/config layer.

Changes

• CLAUDE.md / docs/_base/RULES.md — add shadcn-ui to the .claude/rules/ enumeration so the new rule is discoverable.
• .gitignore — ignore the local .mcp.json MCP server config.
• skills-lock.json — track the lockfile pinning the shadcn skill.

The .claude/rules/shadcn-ui.md rule mandates driving shadcn/ui component work through the skill + MCP tools. It stays local-only (.claude/ is gitignored), consistent with the existing eight rules.

Docs/config only — no application code or behaviour change.

🤖 Generated with Claude Code

Summary by Sourcery

Register the shadcn UI rule and related configuration in the repo’s docs and tooling metadata.

Build:

• Track the shadcn skill in skills-lock.json for tooling configuration.
• Ignore local .mcp.json MCP server configuration in .gitignore.

Documentation:

• Document the new shadcn-ui rule alongside existing project rules in CLAUDE.md and RULES.md.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Registers the new shadcn skill and associated MCP integration in the repo’s docs/config layer, updating rule references, ignoring local MCP config, and adding a skills lockfile entry so the skill is tracked in version control.

File-Level Changes

Change	Details	Files
Document the new shadcn-ui project rule alongside existing Claude rule files so it becomes part of the official constraint set.	Extend the list of rule files in CLAUDE.md to include the new shadcn-ui rule in the .claude/rules/ directory. Update docs/_base/RULES.md to list shadcn-ui as one of the authoritative rule files for the project constraint matrix.	CLAUDE.md docs/_base/RULES.md
Wire repo config to support the shadcn skill + MCP integration while keeping local-only configuration out of version control.	Update .gitignore to ignore the local .mcp.json MCP server configuration file so per-developer settings are not committed. Add skills-lock.json to track the lockfile entry for the shadcn skill, pinning its version/configuration under source control.	.gitignore skills-lock.json

Possibly linked issues

• Register the shadcn MCP + skill integration in repo policy #212: They match exactly: PR updates CLAUDE/docs rules, .gitignore, and skills-lock.json as described in the issue.

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