docs(commands): make arch-evaluate findings honest about certainty

Two audit fixes. Framework-agnostic findings (Claude reading import graphs) now carry a confidence level (High/Medium/Low) and how it was determined, with a required "not fully checked because" note when scale or dynamic imports cap certainty, so a partial read isn't presented as exhaustive. Unconfigured language tools are no longer skipped silently: each detected language whose tool didn't run gets an Info finding, so the audit shows what was and wasn't verified.

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