Promote unanswered-challenge skip to main

[kenobijon]

Summary

Promotes #458 so mainnet validators stop treating ignored image/video asks as onboarding.

• Record refused generator challenge POSTs as no_answer (accepted-then-silent stays challenge_timeout).
• After 5 local no-answers in 24h with zero answers on a modality, skip that miner for that modality instead of parking them in onboarding.
• Key those counts by hotkey so a replacement at a recycled UID does not inherit the prior occupant's totals.
• Keep no_answer out of 24h reward pass rate, including the 1000-row stats window.
• Bump subnet version to 5.0.6 so validators autoupdate.

This unblocks video-only miners (e.g. UIDs 189/207) that were force-assigned image every round after the qualify/slot change. Dual-modality miners who answer stay in onboarding.

Test plan

• pytest tests/test_challenge_allocation.py tests/test_challenge_outcomes.py (17 passed on Skip unanswered modalities instead of treating them as onboarding #458)
• After merge, confirm validator logs include image_unresponsive / video_unresponsive
• Video-only miner: after ~5 ignored image asks, they start getting video probe slots

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