Addresses review comments from PR #209 on the interactive Claude Code example. The filename contained "ubuntu" but used Debian by default, documentation was incomplete, and the code violated DRY principles with unused BoxOptions.

Changes

Naming & consistency

• Renamed interactive_claude_ubuntu_example.py → interactive_claude_example.py
• Changed default box name: claude-ubuntu → claude-box
• Updated logger name to match new filename

Documentation

• Clarified default image is debian:bookworm-slim (not Ubuntu)
• Documented BOXLITE_CLAUDE_BOX_ID environment variable for reattaching to existing boxes
• Added inline comments explaining env variables only affect shell session when reattaching, not box configuration

Code quality

• Removed unused BoxOptions instance (lines 154-160)
• Consolidated imports: from boxlite import Boxlite, InteractiveBox
• Added explanatory comment for empty except asyncio.CancelledError clause

Before:

import boxlite

options = boxlite.BoxOptions(...)  # Created but never used

if BOX_ID:
    box = await runtime.get(BOX_ID)
    await run_interactive_shell(box, env)  # env behavior unclear

After:

from boxlite import Boxlite, InteractiveBox

if BOX_ID:
    # Reattach to existing box by ID
    # Note: env variables are only used for this shell session, not applied to box config
    box = await runtime.get(BOX_ID)
    await run_interactive_shell(box, env)

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