Stabilize software SSGI and restore Windows and stacked CI qualification

[proggeramlug]

Stationary software SSGI flickered because its converged phase history was repeatedly clamped to the current eight-ray neighborhood. Recognize repeated same-surface phase estimates, match their retained RGBA16F precision, and use the stationary integral while preserving responsive filtering when geometry or lighting changes. A new complete-cycle/light-switch regression rejects the previous shader and verifies recovery against fresh history.

Windows qualification also exposed silent GPU-test skips and incorrect resource accounting. Retain the raster device with fresh renderer state per case, honor required adapters/backends, use native texture counts, and explicitly report unimplemented Metal byte counters. Refresh mobile lockfiles, repair clean-checkout/package validation, extract focused renderer modules to satisfy existing size limits, and run CI on stacked PRs.

This draft is stacked on #154. No approved image, quality threshold, performance budget, or file-size limit is raised.

Validation on Radeon 760M / Windows Vulkan:

• Final golden corpus: 89 passed, 4 ignored; two optional Bistro cases need external inputs. Shared library: 484 passed, 1 ignored. The final resource-accounting adjustment passes all 7 focused tests, including 1,000 static frames with no growth.
• PT oracle: three progressive and three motion runs reproduce the original metrics; both seeded faults are rejected. CPU reference output is byte-identical across two runs, with matching geometry/color/shadow sanity checks.
• Frozen SSGI A/B: settled output SSIM reaches 1.0 at 256 square and 1280x720. Median probe cost increases 0.011 ms and 0.044 ms respectively (about 11% on this fixture).
• Contracts and formatting pass. All 23 hosted checks pass at 64d5eed, including macOS shared/golden tests, all mobile targets, native/web builds, browser startup, lint, and contracts. The two scheduled physical-hardware jobs are not PR checks.

Open: HD TAA-jitter exceeds the same limit with both shaders, the two prior Windows portable-baseline discrepancies remain, combined-batch GPU timestamp totals need investigation, and RTX 4080-specific hardware qualification remains unavailable. Reports and the full remaining plan are in docs/evidence/ and docs/windows-engine-plan.md.

Published qualification evidence: archive SHA-256 de9c1beca73bfcf60bf79d3a612b72c072f726f6272576a7f0f60ffdbc7ce25d.

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