feat: Art DAG CLI client

- artdag.py CLI for L1 server interaction
- run: start rendering jobs
- runs: list all runs
- status: check run status
- cache/view: manage cached content (pipe to mpv with -o -)
- assets: list known assets
- import: add files to cache

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# Art DAG Client
+
+CLI for interacting with the Art DAG L1 rendering server.
+
+## Setup
+
+```bash
+pip install -r requirements.txt
+```
+
+## Usage
+
+```bash
+# Set server URL (default: http://localhost:8100)
+export ARTDAG_SERVER=http://localhost:8100
+
+# Or pass with every command
+./artdag.py --server http://localhost:8100 <command>
+```
+
+## Commands
+
+### Server Info
+```bash
+./artdag.py info
+```
+
+### List Known Assets
+```bash
+./artdag.py assets
+```
+
+### Start a Rendering Run
+```bash
+# Using asset name
+./artdag.py run dog cat
+
+# Using content hash
+./artdag.py run dog 33268b6e167deaf018cc538de12dbe562612b33e89a749391cef855b320a269b
+
+# Wait for completion
+./artdag.py run dog cat --wait
+
+# Custom output name
+./artdag.py run dog cat --name my-dog-video
+```
+
+### List Runs
+```bash
+./artdag.py runs
+./artdag.py runs --limit 20
+```
+
+### Check Run Status
+```bash
+./artdag.py status <run-id>
+```
+
+### List Cached Content
+```bash
+./artdag.py cache
+```
+
+### View/Download Cached Content
+```bash
+# Show info
+./artdag.py view <content-hash>
+
+# Download to file
+./artdag.py view <content-hash> -o output.mkv
+
+# Pipe to mpv (use -o - for stdout)
+./artdag.py view <content-hash> -o - | mpv -
+```
+
+### Import Local File to Cache
+```bash
+./artdag.py import /path/to/file.jpg
+```
+
+## Example Workflow
+
+```bash
+# Check server
+./artdag.py info
+
+# See available assets
+./artdag.py assets
+
+# Run dog effect on cat, wait for result
+./artdag.py run dog cat --wait
+
+# List completed runs
+./artdag.py runs
+
+# Download the output
+./artdag.py view <output-hash> -o result.mkv
+```