Run Progress Report

Canonical JSON shape: run-progress-report.json.

The report turns tree-search or campaign events into operator-facing progress:

• progress_points — best score over wall-clock time, with the generation and hypothesis node that caused each score.
• milestones — time to first valid candidate, first passing verifier, first advancement, and threshold success.
• pass_at_k — observed pass@k / best-of-k summaries for configured k values.
• branch_lineage — parent/child hypothesis edges for inspection artifacts.

Python and TypeScript parity is exercised by run-progress-report-parity-fixture.json.