feat(cc-013): add auto memory companion repo with three exercises

Companion repo for CC-013. Covers triggering memory, structuring
MEMORY.md with index and topic files, and proving cross-session
persistence shapes Claude behavior.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# Auto Memory: Claude Code Remembers What You Teach It
+
+Claude Code can remember preferences, decisions, and context across
+sessions. This is not a plugin or an add-on. It is built in. Once you
+know how to trigger it, Claude gets progressively more useful with
+every session.
+
+Companion repo for the article
+[Auto Memory: Claude Code Remembers What You Teach It](https://fromaitochitta.com/cc-013) on From AI to Chitta.
+
+---
+
+## What You Will Learn
+
+By working through the exercises in this repo, you will be able to:
+
+- Trigger auto memory by telling Claude what to remember, and verify
+  the memory file was created
+- Structure MEMORY.md with a lightweight index and separate topic files
+  to stay under the 200-line limit
+- Prove that memory persists across sessions and shapes Claude's behavior
+  without you repeating yourself
+
+These are not theoretical outcomes. Complete the exercises and you will
+have a working memory system in your own project.
+
+## Prerequisites
+
+- Claude Code v2.1.59 or later installed (`claude --version` prints a version)
+- A Claude Pro, Team, or Enterprise subscription
+- A project directory to practice on (this repo works fine)
+
+No npm install, no Docker, no build step.
+
+## Exercises
+
+| # | Exercise | What It Covers |
+|---|----------|---------------|
+| 01 | [Trigger Memory](exercises/01-trigger-memory.md) | Make Claude remember something and verify it sticks |
+| 02 | [Structure Memory](exercises/02-structure-memory.md) | MEMORY.md index and topic files, the 200-line limit |
+| 03 | [Cross-Session Persistence](exercises/03-cross-session.md) | Prove memory accumulates and shapes behavior |
+
+Start at `exercises/01-trigger-memory.md`. Each exercise links to the next.
+
+## How to Use This Repo
+
+**"Show me what it does":** Browse `exercises/` and read through
+the steps. Understand the pattern before you run anything.
+
+**"Let me actually do it":** Open Claude Code in this directory
+and follow the exercises in order. Each one has an expected output
+section so you know when you have succeeded.
+
+```bash
+git clone https://git.fromaitochitta.com/fromaitochitta/claude-code-auto-memory.git
+cd claude-code-auto-memory
+claude
+```
+
+Then open `exercises/01-trigger-memory.md` and follow the steps.
+
+## A Note on Machine-Local Memory
+
+Memory files are stored on your local machine under
+`~/.claude/projects/<project-hash>/memory/`. They are not synced to
+git, not shared with other machines, and not visible to anyone else.
+If you clone this repo on a different machine, you start fresh.
+This is by design.
+
+## Domain
+
+**Claude Code Memory and Instructions** - This repo is part of the
+Claude Code Memory and Instructions series on From AI to Chitta.
+See the full series for related concepts.
+
+## About
+
+Built by [Kjell Tore Guttormsen](https://fromaitochitta.com) as
+part of the From AI to Chitta project, exploring the intersection
+of AI tools and inner development.
+
+MIT License.