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Flip #5559 runner-placement to PlanSound with host-measured numbers + fold PeakFold ByteSize-lift review - #5576
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…d ByteSize-lift - Fill in live srv1 cgroup-measured peaks (2026-06-22): both 'ci' and 'rust_tests' at 25769803776 bytes (24 GiB pessimistic max-over-snapshot); host fixed overhead 17179869184 bytes (16 GiB: OS + sccache + ctrl/media co-tenancy, fail-closed interim) - PeakFold ByteSize-lift: max_bytes:Int -> max_peak:ByteSize, add measure_max to std.realization_width (already committed), eliminate byte_size_count unwrap + byte_size re-wrap in fold_job_peak (unit-system roundtrip was a §3 violation from review) - Export gunbc_ci_runners_per_host() as single authority (R=3 enforced cap per host, fleet_concurrent_runs=6); dissolution trigger: refine once CI measurement emit lands - Flip witness_live_carrier_unmeasured_is_unsound -> witness_live_carrier_measured_derives_plan - runner_placement_holds() returns true; plan: 3 runners/host, ~28.8 GiB cap each Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
… conservative-high gunbc_ci_runners_per_host() now returns conservative_high=10 while gunbc_ci_runner_cap_enforced=false; premature use of the fit-count 3 while ~7 runners co-reside is unwritable at the flag rather than enforced by consumer discipline. Operator flips the flag when the 3-runner cap is live-applied (FENCED). Also documents that 0.8 safety fraction and 16 GiB fixed overhead are non-overlapping: one reserves peak-variance headroom for transient spikes, the other accounts for fixed sibling-cgroup services. - witness_runners_per_host_fail_closed_pre_cap(): discriminating +/- pair (cap_enforced=false AND effective R == conservative_high) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
effective_runners_per_host(cap_enforced: Bool) parametric helper lets the test supply a local true fixture without mutating the global flag. witness_runners_per_host_cap_enforced_derives_model_count() proves the cap_enforced=true branch returns the model-derived per-host count (3) and agrees with runner_deployment_plan(); verifies the operator's eventual flip is correct before they rely on it at apply time. runner_placement_holds() now covers both sides of the discriminating pair. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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