feat: add machine-readable run progress for long commands#21
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Let the long-running commands stream structured JSONL progress so a non-interactive worker can show live progress instead of a flat "running" until exit. sample, propagate, and batch gain two opt-in flags: --progress-format jsonl (records to stderr) and --progress-file PATH (records to a sidecar file). Each line is a compact JSON object with stable keys (event, command, completed, total, elapsed_s), completed increases monotonically, and the final record always has completed == total. A keyword-only progress callback is threaded through run_monte_carlo, run_stochastic_propagation, and run_batch_manifest; default None preserves today's behaviour exactly. Progress is a stderr/sidecar side-channel only: it never touches the --output stream, adds no schema or envelope version, and leaves the result envelope, deterministic results, and exit codes unchanged. elapsed_s is monotonic wall-clock and kept out of golden output. Also ran ruff format on the touched modules to clear pre-existing line-wrap violations in those files.
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Summary
Test Plan
uv run pytestpassesuv run ruff check .passesContract Impact
docs/VERSIONING_POLICY.md