feat(wasm,cli): implement decentralized challenge evaluation pipeline#6

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echobt wants to merge 3 commits intomainfrom

feat/decentralized-challenge-impl

Commits on Feb 18, 2026

feat(cli): add RPC methods for agent journey, submission history, stats, and decay
echobt
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feat(wasm): add submission, LLM review, AST validation, timeout modules and enhance existing modules
echobt
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docs(validator): add validator setup and operations guide
echobt
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