fix(mtmharness): clarify anonymous auth gate

[codeh007]

Summary

• describe the anonymous continuation path in the unauthenticated conversation surface
• stop presenting the expected auth gate as a transport configuration failure
• add a component regression test
• publish as mtmharness 0.5.4

Verification

• pnpm --filter mtmharness run check

Related to codeh007/gomtm#660

[coderabbitai]

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