feat(desktop): NIP-AM agent-usage backend — P2 emission/transport/archive + P4a aggregation/D6 #17189

Job	Run time
Dead Token Reference Guard	8s
Detect Changed Paths	26s
Unit Tests	4m 13s
Security	44s
Desktop E2E Relay	21m 33s
Desktop Core	19m 52s
Rust Lint	2m 56s
Server Cross-Compile (x86_64-unknown-linux-musl)	3m 26s
Windows Rust (x86_64-pc-windows-msvc)	14m 12s
Desktop Build (macOS)	5m 58s
Server Cross-Compile (aarch64-unknown-linux-musl)	3m 18s
Desktop Smoke E2E (4)	14m 6s
Desktop Smoke E2E (2)	11m 3s
Desktop Smoke E2E (1)	10m 55s
Desktop Smoke E2E (3)	10m 17s
Web	0s
Mobile	-1s
Desktop	3s
Backend Integration (relay e2e)	1m 4s
Relay E2E	2m 49s
Desktop E2E Integration (1/2)	6m 50s
Desktop E2E Integration (2/2)	5m 59s
Desktop E2E Integration	2s
	2h 19m 53s

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