docs: P0-#5 ring-validated — integration PASS, wedge finding banked#123
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Controlled-ring validation (3x5090 Poland/Germany/Poland, ~$3.5, torn down): the shipped #120 build + the #122-forwarded knobs serve M2.5 end-to-end over a real 3-region WAN ring with EAGLE on, degraded=false (no false trip), three signed stage receipts chained under one settlement nonce. The sustained- backpressure M1 wedge is not reproducible on a fast datacenter ring by construction (depth-1 EAGLE = no return backlog, loopback buffers autotune to 4-6MB, container has no NET_ADMIN to throttle the tail uplink) — which is exactly why 07-14 only hit the residential box; M1's socket bound is already proven offline in test_ret_stallguard.py. P0-#5 marked DONE; receipt added. Mark P0-#5 done in LAUNCH.md, add the LATEST-4 RESUME-HERE block, close out the plan file, add docs/receipts/eagle-watchdog-ring-20260720.json.
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…123) Controlled-ring validation closes P0-#5: shipped #120 build + #122 knobs serve M2.5 over a real 3-region WAN ring (degraded=false, receipts chained under one nonce); the sustained-backpressure M1 wedge is not reproducible on a fast datacenter ring by construction (depth-1 EAGLE, 4-6MB buffers, no NET_ADMIN) — proven offline in test_ret_stallguard.py. Marks P0-#5 DONE, adds the receipt.
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Closes out P0-#5. Controlled-ring validation (3x5090 WAN, ~$3.5, torn down): the shipped #120 build + #122 knobs serve M2.5 end-to-end over a real 3-region ring, EAGLE on, degraded=false, receipts chained under one settlement nonce = integration PASS. The sustained-backpressure M1 wedge is not reproducible on a fast datacenter ring by construction (depth-1 EAGLE, 4-6MB loopback buffers, no NET_ADMIN) — which is why 07-14 only hit the home box; M1 is proven at the socket layer offline in test_ret_stallguard.py. Marks P0-#5 DONE, adds the receipt + LATEST-4 RESUME-HERE block.