docs(state): post-session refresh + unblock T6-1a Netflix Public dataset deferral

[lusoris]

Summary

Post-session-2026-04-29 refresh of docs/state.md per CLAUDE §12 rule 13.

• Updated _Updated: stamp to 2026-04-29.
• Rewrote the "Tiny-AI C1 baseline fr_regressor_v1.onnx" row in the
  "Deferred (waiting on external dataset access)" section: the
  reopen-trigger is now TRIGGERED 2026-04-29 because the Netflix
  Public training corpus that gated C1 is locally available at
  .workingdir2/netflix/ (9 ref + 70 dis YUVs, ~37 GB, gitignored;
  provided by lawrence 2026-04-27). BACKLOG T6-1a is unblocked.
• Verified the rest of state.md against the 2026-04-29-session merged
  PR set (chore(dnn): T7-12 — remove VMAF_MAX_MODEL_BYTES env override #193–docs(audit): T7-4 — quarterly upstream-backlog re-audit (2026-04-29) #205, perf(sycl): T7-17 — fp64-less device fallback (Arc A380 5-10× speedup) #209). Every PR was feature / chore / docs / perf
  with no bug-status delta to record (PR docs(audit): T7-4 — quarterly upstream-backlog re-audit (2026-04-29) #205 itself explicitly notes
  "no docs/state.md changes — no upstream commit ruled in/out a
  fork bug"; PR chore(backlog): T7-32 — 3 micro-investigations bundled (motion_v2 srlv64 + tiny-vmaf-v2 identity + routine.py FIXME) #198's verify-only sub-tasks are guards, not
  closed bugs).

Deep-dive deliverables (ADR-0108)

• no research digest needed: doc-only state-tracking refresh.
• no alternatives: only-one-way state.md refresh.
• no rebase-sensitive AGENTS invariants in this PR.
• Reproducer / smoke-test command — pre-commit run --files docs/state.md CHANGELOG.md PASS.
• CHANGELOG.md entry — Unreleased § Changed.
• no rebase note needed: doc-only.

Test plan

• pre-commit run --files docs/state.md CHANGELOG.md — every hook PASS.
• Manual cross-check of every 2026-04-29-session merged PR title vs
  a bug-status delta — none of chore(dnn): T7-12 — remove VMAF_MAX_MODEL_BYTES env override #193–docs(audit): T7-4 — quarterly upstream-backlog re-audit (2026-04-29) #205 / perf(sycl): T7-17 — fp64-less device fallback (Arc A380 5-10× speedup) #209 closes / opens / rules
  out a bug, so no row additions were needed.

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