feat: add GHC profiling infrastructure via Nix#282
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Adds hoard_peer_connection_establishment_seconds histogram, observed on the first KeepAlive ping per peer (Connecting → Connected transition). Uses the existing connectedAt timestamp from Connection to measure from connection slot creation through protocol startup.
Add complete profiling setup with: - Separate profiling build with all-functions detail - Helper scripts for heap, time, allocation, and eventlog profiling - Visualization tools (hp2ps, PDF generation) - Gitignore updates for profiling artifacts (.aux, .ps)
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nix run .#profilingnix run .#visualize-heap