fix(records): triage the BUG-048 remainder and correct release notes

[lusoris]

Summary

Triages everything stale-branch merges removed (BUG-048) and fixes the records that still claimed that work shipped. Without this, the 1.0.0-rc.1 release notes would advertise GPU options, performance changes and tooling that the tree does not contain.

• All 63 silent-revert ledger items (sections B–E) were re-checked at the merged train (dd51d00db): 30 restored, 6 moot, 22 missing, 5 need a decision.
• The missing work is filed in docs/state.md by ADR-1341 phase:
  • RC2: T-BUG048-GPU-OPTION-PARITY-REMAINDER-2026-09-26 and T-BUG048-PERF-RESTORATIONS-2026-09-26.
  • RC3: T-BUG048-AI-SCRIPT-HELPERS-2026-09-26.
  • Deferred: T-BUG048-RECORD-DEBT-2026-09-26 (includes three option questions for the maintainer) and ADR-0694's never-filed T-CERT-ERR33-SWEEP.
• Scores are unaffected by any missing item. A model that sets an option a GPU twin lacks keeps that feature on the CPU (libvmaf.c gates on vmaf_feature_extractor_honours_options(), ADR-1183). An explicit request for the twin with that option fails with "unknown option".

RC1 fixes in this PR:

• Removes 14 changelog.d fragments that describe work not in the tree. One claim is made true instead: the dead integer_psnr_* aliases are dropped from extract_k150k_features.py, since libvmaf never emits such keys. The same file's docstring no longer claims automatic /dev/shm scratch selection.
• Stops the CUDA AGENTS.md from documenting the resolution-aware dispatch that ADR-1143 deleted, and marks ADR-0753 superseded.
• Points 11 VIF citations of ADR-0541 at ADR-0597, the number fix(gpu): mirror the CPU integer_adm option table on the CUDA, SYCL and HIP twins #1324 gave the luma-only VIF decision; ADR-0541 is now an unrelated dev-container ADR. The source-citation registry is regenerated with its own writer.
• Runs test_pic_preallocation in the ASan job again. Its exclusion cited a SIGABRT from the release+LTO AVX-512 bug the fork already fixed. Under CI's exact ASan configuration (debug, b_lto=false, b_sanitize=address) it passes 3/3.

Type

• Bug fix (records and CI coverage; no scoring change)

Checklist

• Commits are signed and follow Conventional Commits.
• Pre-commit and the pre-push gate passed locally.
• No public C API, CLI flag or FFmpeg patch surface changes.

Bug-status hygiene

• docs/state.md updated in this PR: five new open rows, two closed rows, and the ADR-1341 disposition table.

Netflix golden-data gate

• No Netflix assertAlmostEqual(...) value was modified.

Deep-dive deliverables

• Research digest — no digest needed: trivial (item-by-item evidence lives in the docs/state.md rows).
• Decision matrix — no alternatives: only-one-way fix (phase placement follows ADR-1341; records are corrected to match the tree).
• AGENTS.md invariant note — core/src/feature/cuda/AGENTS.md and tools/vmaf-tune/AGENTS.md corrected.
• Reproducer / smoke-test command — below.
• CHANGELOG fragment — changelog.d/changed/release-notes-bug048-corrections.md.
• Rebase note — no rebase impact: records, docs and one CI exclusion list only.

Reproducer

bash scripts/ci/check-state-md-rows.sh
python3 -B scripts/ci/check-source-adr-citations.py
make docs-fragments-check
meson setup build-asan core -Denable_cuda=false -Denable_sycl=false \
  --buildtype=debug -Db_lto=false -Db_sanitize=address -Db_lundef=false
ninja -C build-asan test/test_pic_preallocation
ASAN_OPTIONS=detect_leaks=1 ./build-asan/test/test_pic_preallocation