v0.18.4

Added

• DeepSWE planner export schema v3 pins per-task published sample size and variance so one-repetition studies can report labeled published_proxy inference when observed Welch variance is unavailable.

Changed

• Study reports prefer observed Welch inference when every required task has at least two completed repetitions in both arms. Schema-v3 selections otherwise use shared published-proxy variance; schema-v2 selections without those pins remain unavailable at one repetition.
• Reports record inference source and published-variance provenance and surface selector versus executed model or reasoning mismatches.