Add --json flag to todo.py that prints tasks as a JSON list

Plan FEATURE S · Add --json flag to todo.py that prints tasks as a JSON list

Steps

1. Write test_todo.py (unittest) that calls main(['--json']) with captured stdout and asserts json.loads(output) == TASKS, plus a check that main([]) still prints the numbered list; confirm it fails
2. In todo.py add `import json` and, in main, if '--json' in argv print json.dumps(TASKS) and return, leaving the numbered output otherwise unchanged
3. Run the test and the shell checks to confirm they pass

Checks

• PASS Running `python todo.py --json` prints TASKS as a JSON list that parses back to the same listpython todo.py --json | python -c "import sys, json; assert json.load(sys.stdin) == ['buy milk', 'write report']" (failed before the work)
• PASS Running `python todo.py` with no flag still prints the numbered list, and `--json` output is not numbered textpython todo.py | grep -qx '1. buy milk' && ! python todo.py --json | grep -q '^1\. ' && python todo.py --json | grep -q '^\[' (failed before the work)
• PASS A test in test_todo.py covers the --json output and passespython -m unittest test_todo (failed before the work)

Changed

• test_todo.py +25
• todo.py +4

Closed T-0001 closed; committed a1bc78b (2 files). Undo: git revert --no-edit a1bc78b (tokens: 99493 in, 989 out)

3 worker turns · 100k tokens · 1m09s · replay it: fm code tui --events demo/examples/feature.jsonl · the case study