fix: use .get() for file_structure keys to prevent KeyError in workdir extras

[wgnrai]

Problem

When a project's project.json has a file_structure section that is missing the gitignore key, the _75_include_workdir_extras extension crashes with a KeyError during prepare_prompt(). This kills the agent's monologue loop silently, causing the entire agent to halt with no error output.

KeyError: 'gitignore'

  File ".../_75_include_workdir_extras.py", line 33, in execute
    gitignore_raw = project["file_structure"]["gitignore"]

This is especially problematic because project.json files created without a gitignore field (or with partial file_structure configs) will crash every agent loop iteration.

Fix

Replace direct dict access with .get() and sensible defaults for all file_structure keys:

• enabled -> .get("enabled", False)
• max_depth -> .get("max_depth", 0)
• gitignore -> .get("gitignore", "")

Files Changed

• extensions/python/message_loop_prompts_after/_75_include_workdir_extras.py - 3 lines

Impact

This bug can cause agents to silently freeze/halt when a project is missing the gitignore key in its file_structure config. The fix ensures graceful degradation with defaults.