Merges worktree-feat+us-016 into master. Combined both sets of _NodeEntry
fields: hf_repo/num_layers (HEAD) and relay_addr/cert_fingerprint/peer_id
(US-017). Kept HEAD's auto-shard tracker query and shard_label formatting.
US-016: mining-style startup CLI with live ASCII dashboard, hardware
detection, auto-shard range detection from model layer count, tracker
network-assign integration for gap-filling.
US-017: P2P gossip protocol, NAT-traversal relay node, TLS peer
authentication via cert fingerprint.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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