PROMPT 07 Public Api

# Implementation Prompt 07: Public API Module

**Goal:** Create the public API module (McpClient) with high-level functions for starting connections, making requests, and managing the client.

**Test Strategy:** TDD with rgr. All tests green, no warnings.

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## Context: What You're Building

You're implementing the user-facing API that wraps the Connection state machine. This provides:
1. **Connection lifecycle**: `start_link/1`, `stop/1`
2. **MCP operations**: `call_tool/3`, `list_tools/1`, `list_resources/1`, etc.
3. **Configuration**: Simple keyword list interface
4. **Error handling**: Normalized error returns

Users will interact with this module, not directly with Connection.

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## Required Reading: API Specification

From MVP_SPEC.md and ADRs:

### Supported MCP Methods (MVP Scope)

**Tools:**
- `tools/list` → `list_tools/1`
- `tools/call` → `call_tool/3`

**Resources:**
- `resources/list` → `list_resources/1`
- `resources/read` → `read_resource/2`
- `resources/templates/list` → `list_resource_templates/1`

**Prompts:**
- `prompts/list` → `list_prompts/1`
- `prompts/get` → `get_prompt/2`

**General:**
- `ping` → `ping/1`
- `initialize` → (internal, handled by Connection)

### Configuration Options