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>

CLAUDE.md

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+# Auto Memory: Claude Code Remembers What You Teach It
+
+## What this project is
+
+A companion repo for the From AI to Chitta article on **Auto Memory**
+(concept ID: `CC-013`). It contains exercises that let you build and
+verify a working cross-session memory system in Claude Code.
+
+Article: https://fromaitochitta.com/cc-013
+
+## How to use this
+
+1. Open Claude Code in this directory: `cd claude-code-auto-memory && claude`
+2. Work through exercises in order: `exercises/01-trigger-memory.md`, then 02, then 03
+3. Each exercise has concrete steps with expected output
+4. Compare your results to the expected output described in each exercise
+
+## Code quality expectations
+
+- This is a learning repo. Clarity over cleverness.
+- Every exercise must run without modification on a clean clone
+- No external dependencies
+- If something does not work as expected, that is useful information: note it
+
+## Project structure
+
+```
+exercises/          Numbered exercises with steps and expected output
+CLAUDE.md           This file: project instructions
+README.md           Overview for anyone who clones this repo
+```
+
+## Domain
+
+Claude Code Memory and Instructions
+
+## Memory
+
+Keep session notes in a local `MEMORY.md` (gitignored). This file
+(CLAUDE.md) is for instructions. MEMORY.md is for state.
+
+Note: memory files for this project are stored at
+`~/.claude/projects/<project-hash>/memory/`. Machine-local only.