Fixes#5767.
Retain exact WABT version-probe output and tool identity, including nonzero command failures, and provide condition-specific configuration recovery. Verified with 54 focused tests, the final 51-case real WABT CLI/MCP lane, actual Codex recovery trials, and independent source reviews. No provider installation, target execution or admission relaxation.
Assisted-by: Kogasa (gensokyo-skills:kogasa-surprise-testing)