env: meta-RL refactor (continuous profiles, action+belief, adaptation grader)

env: enrich observation with history, anomalies, and discovery bonus

Rebuild as Life Simulator: 5 meters, 3 hidden profiles, GRPO training pipeline

Fix bugs, add tests, and improve code quality

Add custom task input support and update URLs to HF Space

Initial commit: RhythmEnv daily planning RL environment