docs(state): audit Open bugs and move resolved rows to Recently closed (#1238)

[lusoris]

Summary

Audited all 19 rows under ## Open bugs in docs/state.md against git log and origin/master to resolve issue #1238.

• Moved four confirmed-fixed bug rows from ## Open bugs to ## Recently closed with merged PR and commit citations:
  • T-UPSTREAM-818-POOLING-ENUM-NO-PERCENTILES-2026-09-03 (fixed by PR feat(core): add percentile temporal pooling to the public C API #1340, commit b43fc4414)
  • T-AI-PTQ-STATIC-QUANT-FORMAT-UNPINNED-2026-09-03 (fixed by PR fix(ai): pin ONNX Runtime static-PTQ output format to QDQ #1306, commit aebb9e19a)
  • T-SVTAV1-HDR-ADAPTER-2026-05-20 (fixed by PR fix(vmaf-tune): address report audit findings #2-#10 and document SVT-AV1-HDR knobs #1296, commit e335857f4)
  • T-VMAFTUNE-PROFILE-REPORT-AUDIT-2026-05-20 (fixed by PR fix(vmaf-tune): address report audit findings #2-#10 and document SVT-AV1-HDR knobs #1296, commit e335857f4)
• Restored two recently closed rows accidentally deleted during dedup in commit 02f9ee455:
  • T-METAL-MOTION-V2-MIRROR-OFF-BY-ONE-2026-09-03 (fixed by PR fix(metal): close out motion_v2 mirror reflect-101 parity and test observability #1294, commit 8d103e3cc)
  • T-UPSTREAM-1564-ADM-CM-GPU-BORDER-AND-ROUNDING-2026-09-03 (fixed by PR fix(feature): row-level rounding and border indexing in integer ADM GPU kernels (ADR-1167) #1224, commit 6c843bb84)
• Deduplicated tombstone comments under ## Open bugs.
• Added changelog fragment changelog.d/changed/docs-1238-state-md-stale-rows.md and regenerated CHANGELOG.md.

Closes #1238.

Type

• feat — new feature
• fix — bug fix
• perf — performance improvement
• refactor — no behavior change
• docs — documentation only
• test — test-only
• build / ci — tooling / infra
• port — cherry-pick from upstream Netflix/vmaf
• sycl / cuda / simd — backend-specific

Checklist

• Commits follow Conventional Commits (the commit-msg hook enforces this).
• make format && make lint is green locally.
• Unit tests pass: meson test -C build.
• If I touched any SIMD/GPU code path, I ran /cross-backend-diff and the worst ULP is ≤ 2.
• If I touched a feature extractor with SIMD/GPU twins, I either updated every twin or listed the gap under "Known follow-ups" below.
• If I added a new .c / .cpp / .cu / .h / .hpp, it has the appropriate license header (see CONTRIBUTING.md).
• If this is a breaking change, the commit message uses ! or BREAKING CHANGE: and the migration path is documented below.
• If this PR adds an ADR, the ADR row lives in docs/adr/_index_fragments/<NNNN-slug>.md and the slug is appended to docs/adr/_index_fragments/_order.txt — do not edit docs/adr/README.md directly (regenerated by scripts/docs/concat-adr-index.sh; see ADR-0221).

Bug-status hygiene (ADR-0165)

• docs/state.md updated in this PR with a row in the appropriate section (Open / Recently closed / Confirmed not-affected / Deferred), OR no state delta: REASON.

Netflix golden-data gate (ADR-0024)

• I did not modify any assertAlmostEqual(...) score in the Netflix golden Python tests.
• If I believe a golden value must change, I have explained why below AND pinged @lusoris for a CODEOWNERS exception.

Deep-dive deliverables (ADR-0108)

• Research digest — no digest needed: documentation-only state ledger audit
• Decision matrix — no alternatives: mechanical ledger sync to master
• AGENTS.md invariant note — no rebase-sensitive invariants: state ledger audit
• Reproducer / smoke-test command — bash scripts/ci/check-state-md-rows.sh
• CHANGELOG fragment — changelog.d/changed/docs-1238-state-md-stale-rows.md
• Rebase note — no rebase impact: documentation and changelog updates only

Reproducer

bash scripts/ci/check-state-md-rows.sh

Known follow-ups

None.