feat: initial companion repo for CC-001 Agent Loop

exercises/01-watch-the-loop.md

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+# Exercise 01: Watch the Loop
+
+**Concept:** The Agent Loop (CC-001)
+**Level:** Basic
+**Time:** ~10 minutes
+
+---
+
+## Objective
+
+Watch Claude Code execute a multi-step task from start to finish.
+You will see the agent loop in action: Claude reads, thinks, picks
+a tool, observes the result, and repeats until done.
+
+This is your first hands-on contact with the agent loop. No prior
+experience with Claude Code required beyond having it installed.
+
+---
+
+## Before You Start
+
+Confirm you have:
+
+- [ ] Claude Code installed (`claude --version` prints a version)
+- [ ] This repo cloned and open in your terminal
+- [ ] Started Claude Code in this directory (`claude`)
+
+---
+
+## Instructions
+
+**Step 1:** Open Claude Code in this repo directory.
+
+```bash
+cd claude-code-agent-loop
+claude
+```
+
+**Step 2:** Paste this prompt into Claude Code:
+
+```
+Create a file called loop-demo.md that contains:
+
+1. Today's date and time
+2. A list of all files in this directory with their sizes
+3. The first 5 lines of README.md
+4. A summary sentence describing what this repo is about
+
+Do not ask me any questions. Just do it.
+```
+
+**Step 3:** Watch the terminal output carefully as Claude works.
+
+You will see Claude make a series of tool calls. Pay attention to:
+- Which tools Claude picks (Bash, Read, Write, Glob)
+- The order it chooses to do things
+- How it uses the output of one step to inform the next
+- That you did not tell it which tools to use or what order
+
+**Step 4:** Read the generated `loop-demo.md` file.
+
+Check that it contains all four items from the prompt. Claude gathered
+information from multiple sources (system clock, file system, file
+contents) and synthesized them into one output file.
+
+---
+
+## Expected Output
+
+After 15-30 seconds, you should see:
+
+- A new file `loop-demo.md` in the repo root
+- It contains today's date (from a Bash call to `date`)
+- It lists files with sizes (from `ls -la` or similar)
+- It includes the first 5 lines of README.md (from Read tool)
+- It ends with a summary sentence about the repo
+
+The exact content varies, but the structure should match.
+
+**How you know the agent loop worked:**
+- Claude made 3-5 tool calls without asking you anything between them
+- Each tool call built on information from the previous one
+- The final file synthesizes data from multiple sources
+
+---
+
+## What You Learned
+
+- **The loop is autonomous:** Claude decided the order and tools on its own
+- **Each step informs the next:** The loop observes results before choosing the next action
+- **The task, not the steps, is what you specify:** You said what you wanted, not how to get it
+
+---
+
+## Clean Up
+
+Delete the generated file so the repo stays clean:
+
+```bash
+rm loop-demo.md
+```
+
+---
+
+## Next
+
+Ready to go further? Move to [Exercise 02: Control the Loop](./02-control-the-loop.md).