feat: add new OpenSpec skills for change management and onboarding

- Created `openspec-ff-change` skill for fast-forward artifact creation.
- Introduced `openspec-new-change` skill for structured change creation.
- Developed `openspec-onboard` skill for guided onboarding through OpenSpec workflow.
- Added `openspec-sync-specs` skill for syncing delta specs to main specs.
- Implemented `openspec-verify-change` skill for verifying implementation against change artifacts.
- Updated `.gitignore` to exclude OpenSpec generated files.
- Added `skills-lock.json` to manage skill dependencies.

.agents/skills/shadcn/mcp.md

@@ -0,0 +1,94 @@
+# shadcn MCP Server
+
+The CLI includes an MCP server that lets AI assistants search, browse, view, and install components from registries.
+
+---
+
+## Setup
+
+```bash
+shadcn mcp        # start the MCP server (stdio)
+shadcn mcp init   # write config for your editor
+```
+
+Editor config files:
+
+| Editor | Config file |
+|--------|------------|
+| Claude Code | `.mcp.json` |
+| Cursor | `.cursor/mcp.json` |
+| VS Code | `.vscode/mcp.json` |
+| OpenCode | `opencode.json` |
+| Codex | `~/.codex/config.toml` (manual) |
+
+---
+
+## Tools
+
+> **Tip:** MCP tools handle registry operations (search, view, install). For project configuration (aliases, framework, Tailwind version), use `npx shadcn@latest info` — there is no MCP equivalent.
+
+### `shadcn:get_project_registries`
+
+Returns registry names from `components.json`. Errors if no `components.json` exists.
+
+**Input:** none
+
+### `shadcn:list_items_in_registries`
+
+Lists all items from one or more registries.
+
+**Input:** `registries` (string[]), `limit` (number, optional), `offset` (number, optional)
+
+### `shadcn:search_items_in_registries`
+
+Fuzzy search across registries.
+
+**Input:** `registries` (string[]), `query` (string), `limit` (number, optional), `offset` (number, optional)
+
+### `shadcn:view_items_in_registries`
+
+View item details including full file contents.
+
+**Input:** `items` (string[]) — e.g. `["@shadcn/button", "@shadcn/card"]`
+
+### `shadcn:get_item_examples_from_registries`
+
+Find usage examples and demos with source code.
+
+**Input:** `registries` (string[]), `query` (string) — e.g. `"accordion-demo"`, `"button example"`
+
+### `shadcn:get_add_command_for_items`
+
+Returns the CLI install command.
+
+**Input:** `items` (string[]) — e.g. `["@shadcn/button"]`
+
+### `shadcn:get_audit_checklist`
+
+Returns a checklist for verifying components (imports, deps, lint, TypeScript).
+
+**Input:** none
+
+---
+
+## Configuring Registries
+
+Registries are set in `components.json`. The `@shadcn` registry is always built-in.
+
+```json
+{
+  "registries": {
+    "@acme": "https://acme.com/r/{name}.json",
+    "@private": {
+      "url": "https://private.com/r/{name}.json",
+      "headers": { "Authorization": "Bearer ${MY_TOKEN}" }
+    }
+  }
+}
+```
+
+- Names must start with `@`.
+- URLs must contain `{name}`.
+- `${VAR}` references are resolved from environment variables.
+
+Community registry index: `https://ui.shadcn.com/r/registries.json`