Initial structure: add CLAUDE.md, LICENSE, README.md, and deal-lookup skill

Co-Authored-By: Paperclip <noreply@paperclip.ing>

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Overview
+
+This is a **CartSnitch skills repository**. Skills are reusable tools that extend Claude Code's capabilities. Each skill lives in its own top-level directory.
+
+## Skill Structure
+
+Each skill follows this convention:
+- **`<skill-name>/SKILL.md`** — Required. Contains YAML frontmatter (`name`, `description`) and usage documentation. This is the entry point Claude Code reads when invoking the skill.
+- **`<skill-name>/scripts/`** — Optional. Implementation scripts (bash). Scripts use `set -euo pipefail` and the `die()` pattern for error handling.
+- **`<skill-name>/references/`** — Optional. Supporting reference docs.
+
+## Current Skills
+
+- **`deal-lookup`** — Stub skill for looking up grocery deals. Placeholder implementation awaiting real data source integration.
+
+## Key Patterns
+
+- Skills are self-contained bash/markdown — no CI/CD, no package.json, no build tooling.
+- Scripts use `set -euo pipefail` and the `die()` function for error handling.
+- No centralized build, test, or lint system.
+
+## Contributing
+
+To add a new skill:
+1. Create a `<skill-name>/` directory at the root.
+2. Add `<skill-name>/SKILL.md` with YAML frontmatter (`name`, `description`) and documentation.
+3. Optionally add `<skill-name>/scripts/` for bash implementation.
+4. Submit a PR following the standard SDLC workflow.
+
+## Importing into CartSnitch
+
+Company skills are imported by authorized managers via the Paperclip company skills API. Once imported, skills can be assigned to agents for use in their agent configuration.

LICENSE

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+MIT License
+
+Copyright (c) 2024 CartSnitch
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# CartSnitch Skills
+
+This repository contains reusable skills for CartSnitch agents. Skills extend Claude Code's capabilities with domain-specific knowledge and tooling.
+
+## What is a Skill?
+
+A skill is a self-contained module that provides:
+- Documentation on when and how to use it
+- Optional bash scripts for implementation
+- Reference materials for context
+
+## Skills
+
+| Skill | Description |
+|-------|-------------|
+| `deal-lookup` | Looks up grocery deals and promotions |
+
+## Creating a Skill
+
+1. Create a directory: `<skill-name>/`
+2. Add `SKILL.md` with YAML frontmatter:
+   ```yaml
+   ---
+   name: <skill-name>
+   description: One-line description of what the skill does
+   ---
+   ```
+3. Follow with usage documentation.
+4. Optionally add `scripts/` for bash implementation or `references/` for supporting docs.
+
+## Contributing
+
+Submit skills via pull request following the CartSnitch SDLC workflow. Once merged, authorized managers can import skills into the company skill library via the Paperclip API.

deal-lookup/SKILL.md

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+---
+name: deal-lookup
+description: Look up grocery deals and promotions from the CartSnitch deal database
+---
+
+# Deal Lookup Skill
+
+This skill provides agents with the ability to search for grocery deals and promotions.
+
+## Usage
+
+When asked to find deals, discounts, or promotions for grocery items, use this skill to query the deal database.
+
+## Placeholder
+
+This is a stub implementation. Real integration requires:
+- Connection to the CartSnitch deal data source
+- Query interface for searching current promotions
+- Response formatting for deal results