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The device gate: Redmi 2f7cbe2e, reboot-clean, paired A/B in one thermal window (arms interleaved, best-of-3 then best-of-2), rd12 + DirectGLES. inproc vs spawn client CPU p50 7.880/7.889 vs 7.876/7.869 (-0.15%) and 7.987/7.989 vs 7.992/8.009 (+0.16%) - a tie inside the 0.2-4.2% within- arm spread, sign flipping with arm order, recorded and not gated. monolith is ~30% dearer. 22/22 runner exits clean, 44/44 PINNED, zero Fatal. The three mandatory numbers: socket doorbell vs condvar is a tie too - client 121.1 waits/frame identical across transports, server 10 866-11 963 (inproc) vs 10 415-10 416 (spawn) waits/frame, and the contract's 'converting that into ~4 blocking reads may be cheaper' did not pay off; the only column where the socket is worse is clipark/f (6.07 vs 5.60/5.75). SEG_STAGE bytes/frame: 130.8 KB median / 8.01 MB steady (OpenRA), 816.2 KB / 1.53 MB (rd12). Records/frame post-chunking: 211/206 and 7 497/7 504. maxrec stays 1808 - the 8 MiB chunk budget is never reached. Both framings reported throughout (the startup window runs ~7x the steady state) rather than the flattering one. MEASUREMENTS.md gains section 12 with the full protocol and tables; the 6.3 'no post-chunking distribution exists' gap now points there. CURRENT_STAGE_PROGRESS.md marks gates 7/8 met and records the closeout work plus two structural limits (spawn client windowed fields are zero by construction - OnPresent runs in the server process - though its run totals are valid stores; the stats dump is role-derived). ROADMAP marks P6 closed in the stage table, the header and the milestone. Evidence: notes/p6/gate7-device-ab.md, gate8-doorbell-device.md, gate8-wire-counters.md, git-worktree-fix.md. check_doc_citations: 82 citations in the three documents, 0 problems.