fix(design): log per-harness auto-enqueue skips

[echobt]

Summary

• Round-loop auto-enqueue now warns on each EnqueueRoundResult.skipped entry (harness id, hotkey, round, reason) instead of discarding them silently.
• Miner troubleshoot row updated: check with lowercase hex hotkey (GET /v1/miners/{hotkey}), latest-active harness, scheduled quota, and admin requeue skipped.reason.

Context

Live check for miner harness bed1f30c… / hotkey 587a2406… on round 206772: not a skip — run 09880a61… is queued (enqueued ~05:22 UTC after #124 prod pin). Platform had 194/194 active harnesses with a run. Silent-skip logging was still a real ops gap for future quota/elimination cases; enqueue itself is healthy.

Test plan

• cargo test -p design-http --lib auto_enqueue
• cargo clippy -p design-challenge --all-targets -- -D warnings
• After merge: confirm prod logs show auto-enqueue skipped harness when a harness hits scheduled quota (or via admin requeue dry observation)
• No emergency prod deploy required for the reported miner (already queued)

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📥 Commits

Reviewing files that changed from the base of the PR and between 63871a2 and e5753ec.

📒 Files selected for processing (2)

• crates/design-challenge/src/orchestrator.rs
• docs/external-miner/troubleshoot.md

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