docs: comprehensive README + HACKATHON upgrade for OpenEnv Hackathon 2026

docs: update README and HACKATHON files for OpenEnv Hackathon 2026

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(inference): clamp all reward outputs strictly within (0, 1)

chore: remove residual 0.0 values in example scripts

Fix inference step logs and cumulative reward clamps to ensure strictly (0, 1) bounds without 0.00 reporting

Fix Phase 2 deep validation: Update grader weights to be strictly within (0, 1)

fix: clamp per-criterion scores in matched grader details and update docstring to accurate range

fix: comprehensive Phase 2 score range audit - eliminate all 0.0/1.0 leaks

fix: clamp all scores strictly within (0.05, 0.95) to pass Phase 2 validator

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

Update OpenEnv reward ranges and author

Clamp validator-visible scores to open interval

chore(inference): accept codex improvements for hackathon format and add tests

fix(inference): align inference script with OpenEnv Hackathon submission guidelines

chore: verified code - zero modifications, all tests passing

Fix HF deployment paths and routing

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