feat: add mem-search skill and Claude Desktop integration documentation

desktop-skill/Skill.md

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+---
+name: mem-search
+description: Search your persistent memory database from previous coding sessions. Use when asked about past work, decisions, bugs fixed, or development history.
+---
+
+## Overview
+
+Search your local memory database for past sessions, decisions, code changes, and development history. This skill uses the `mem-search` MCP server tools.
+
+## Available MCP tools
+
+Use these tools from the `mem-search` MCP server:
+
+| Tool | Description |
+|------|-------------|
+| `search` | Unified search across all memory types |
+| `decisions` | Find architectural/design decisions |
+| `changes` | Find code changes and refactorings |
+| `timeline` | Get observations around a specific point in time |
+| `find_by_file` | Find observations for specific files |
+| `find_by_type` | Filter by type (decision, bugfix, feature, refactor, discovery, change) |
+| `find_by_concept` | Find by concept tags |
+| `how_it_works` | Understand system architecture and design patterns |
+
+## Common parameters
+
+- `query` - Natural language search query
+- `limit` - Max results (1-100, default 20)
+- `format` - `index` for titles only (recommended), `full` for complete content
+- `type` - Filter: observations, sessions, or prompts
+- `obs_type` - Filter observation type: decision, bugfix, feature, refactor, discovery, change
+
+## When to use
+
+- "Did we already solve this?"
+- "How did we do X last time?"
+- "Find the bug fix for..."
+- "What decisions did we make about..."
+- "Show me changes to [file]"
+- "What work did we do on [project]?"
+
+## Setup requirement
+
+The `mem-search` MCP server must be configured in Claude Desktop settings. See MCP configuration docs.