fix: Phase 2 compliance - API_KEY env var, score= in END line, openenv.yaml spec fields, flush=True, safe StaticFiles mount

fix(reward): eliminate exact zeroes in component breakdowns to enforce broad safe floating point range uniformly

fix(grader): keep scores within 0.05 and 0.95

fix(grader): explicitly clamp scores to [0.01, 0.99] as required by validator bounds

Clamp validator-visible scores to open interval

chore: verified code - zero modifications, all tests passing

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