fix(release): run no-argv tests on Windows

.agents/roadmap_v1.md

@@ -105,6 +105,12 @@ issue is not yet placed. Keyed record: update in place, never append.
 | [#517](https://github.com/mudler/vllm.cpp/issues/517) | `MODEL-TEXT-nemotron-h-nemotron-hfor-causal-lm` | Run Nemotron-3.5-Lightning-30B-A3B-NVFP4 e2e: NemotronH hybrid (23 Mamba2 / 6 GQA / 23 non-gated relu2 MoE), first MIXED_PRECISION checkpoint | feature |
 | [#512](https://github.com/mudler/vllm.cpp/issues/512) | `ENG-RELEASE-WINDOWS` | Windows release runner rejects empty process arguments, so windows-msvc-cpu fails on EVERY pr independently of #514 | bug |
 | [#514](https://github.com/mudler/vllm.cpp/issues/514) | `ENG-RELEASE-WINDOWS` | `tests/vt/test_backend_cross_device.cpp` uses POSIX `setenv`/`unsetenv`, so both windows-msvc jobs fail on EVERY pr while `main` stays green (they are skipped on push) | bug |
+| [#525](https://github.com/mudler/vllm.cpp/issues/525) | `ENG-RELEASE-WINDOWS` | Windows release contract recorder misreports non-empty argv | bug |
+| [#537](https://github.com/mudler/vllm.cpp/issues/537) | `ENG-RELEASE-WINDOWS` | Windows OpenAI socket smoke fast-fails instead of reporting a reset response | bug |
+| [#540](https://github.com/mudler/vllm.cpp/issues/540) | `ENG-RELEASE-WINDOWS` | Windows Vulkan strict build rejects shadowed KV-cache test locals | bug |
+| [#599](https://github.com/mudler/vllm.cpp/issues/599) | `ENG-RELEASE-WINDOWS` | Windows release contract failure fixture is not portable under PowerShell on Linux | bug |
+| [#645](https://github.com/mudler/vllm.cpp/issues/645) | `ENG-RELEASE-WINDOWS` | LTX2 sources reintroduce non-portable `M_PI` and break the Windows release gate | bug |
+| [#648](https://github.com/mudler/vllm.cpp/issues/648) | `ENG-RELEASE-WINDOWS` | `VideoEngine` uses unguarded POSIX `stat` in the native Windows build | bug |
 | [#515](https://github.com/mudler/vllm.cpp/issues/515) | `ENG-RECORD-CONFLICT-SURFACES` | check-doc-checkpoint treats every root `CMakeLists.txt` edit as a usage change, so adding a source file demands a `docs/USAGE.md` edit with nothing true to say | bug |
 | [#547](https://github.com/mudler/vllm.cpp/issues/547) | — | GB10 reports `UnifiedMemory()` true, so `ReferenceTierEligible(kCUDA)` runs the CPU host kernel over `cudaMalloc` pointers; it needs `DeviceMemoryIsHostAddressable()` | bug |
 | [#569](https://github.com/mudler/vllm.cpp/issues/569) | `MODEL-TEXT-nemotron-h-nemotron-hfor-causal-lm` | The Nemotron revision pin was existence-only: a substituted checkpoint still resolved, and W6's token gate cannot see that | bug |

.agents/specs/cpu-llamacpp-floor-x86-2026-08-11.md

@@ -5,7 +5,8 @@ matrix](../backend-matrix.md)) · `QUANT-GGUF-COMPUTE`
 ([quantization matrix](../quantization-matrix.md)) ·
 `ROAD-V1-D1` punch-list item 13, CPU half
 ([roadmap-v1-completion](roadmap-v1-completion.md)) ·
-**issue:** [#433](https://github.com/mudler/vllm.cpp/issues/433) ·
+**issues:** [#433](https://github.com/mudler/vllm.cpp/issues/433),
+[#530](https://github.com/mudler/vllm.cpp/issues/530) ·
 **claim:** `CLAIM-CPU-X86-FLOOR-1` · **base:** `31a2b493`.
 
 ## Scope
@@ -289,3 +290,48 @@ presented G4's 3.38x/8.20x/2.29x as the live position. Both now point at
 **Out of scope and stated as such.** The Metal/MLX half of `ROAD-V1-D1`
 punch-list item 13 needs an Apple M4, which this host is not, and was not
 touched.
+
+### Follow-up repair contract: issue #530
+
+The exact release-repair candidate
+`6f5b98afd4019d6dca492e8ee1edc135163b9d5e` passed the full operator gate,
+then exposed a nondeterministic defect while the required handoff gate was
+being chained to its push. The smoke harness sets `BUSY_WINDOW=0` and
+`QUIET_BUSY=100`; `busy_pct` separately opens `/proc/stat` for `stat_busy` and
+`stat_total` at each side of that zero-length interval. On a contended host the
+counter boundaries disagree, producing impossible readings including 110%.
+`test_a_contended_leg_is_discarded_and_never_summarised` then exits 4 for no
+quiet window instead of reaching its intended foreign-work discard and exit 2.
+The same immutable tree passed when scheduling happened not to expose the split
+snapshot, and failed twice when chained to the push.
+
+Repair each sample, not the threshold. One read of the aggregate `cpu` line
+must derive both busy and total counters, and both `busy_pct` and `run_leg` must
+consume paired samples. Preserve which fields count as busy, the fresh-window
+policy, builder detection, `QUIET_BUSY`, `FOREIGN_MAX`, discard semantics,
+evidence format, and every accepted benchmark value. Do not clamp the result,
+raise a ceiling, add a retry to the unit test, or make contention disappear.
+
+RED-first coverage must reject the current split `stat_busy`/`stat_total`
+reads and require both call sites to use one paired snapshot. Mutation must
+restore a split sample independently in `busy_pct` and `run_leg`; each must
+make the focused contract red. Focused green is the complete
+`test_cpu_x86_llamacpp_floor.py` suite under current host contention. The fresh
+reviewer mutates both call sites, the operator runs the full preflight, and an
+unchanged exact SHA must pass that gate immediately before the plain push.
+
+The #530 implementation replaces the separate `stat_busy` and `stat_total`
+readers with one `stat_sample` reader. A single `awk` invocation derives the
+unchanged busy-field sum and total-field sum from the same aggregate `cpu` line,
+and both `busy_pct` and `run_leg` read paired before/after samples. No threshold,
+clamp, retry, discard rule, evidence format, or benchmark value changed.
+
+RED-first structural coverage rejected the split reader functions and call
+sites. The pre-edit full preflight also reproduced the operational failure:
+`test_a_contended_leg_is_discarded_and_never_summarised` observed impossible
+`busy=110%` with `BUSY_WINDOW=0` and returned 4 instead of its intended 2.
+After the repair, the complete focused suite passed 11/11 under the same host
+contention. Independently splitting the initial snapshot in `busy_pct` and in
+`run_leg` made the focused structural contract fail for the mutated consumer;
+the script was restored byte-for-byte after both mutations. The full unstaged
+repository preflight then passed, including the complete CPU floor suite.