…+ distill-train 9/9 sweep close

Canonical record of today's continuation cycle (PRs #1442 + #1443).
Closes the two §43.6 next-session pickup items in one v2.89.0 amendment.

Chain landed (post-§43 v2.88.0):
- #1442: FALSIFY-CPU-GPU-005 part b implementation
  ~70 LOC inline at try_apr_wgpu_inference (gguf_gpu_generate.rs
  ~441-510). Probe-token CPU forward via
  OwnedQuantizedModel::forward_single_with_cache (tiny max_seq=2
  cache) + wgpu single-step replay using the same fwd.forward_layer
  code path the autoregressive loop uses + cosine compare via
  cpu_vs_gpu_cosine_similarity (helper from #1440). < 0.99 → emit
  WGPU_FALLBACK_LOG_PREFIX + return None. Probe error paths
  fail-closed. Symmetric to §41 CUDA parity_gate. Contract
  apr-cpu-vs-gpu-output-parity-v1 v1.2.0 → v1.3.0 ACTIVE.

- #1443: distill-train 9/9 falsifier sweep close
  TRAIN-007 PARTIAL via pv validate (live: 0 errors / 0 warnings).
  TRAIN-008 PARTIAL via cargo test cli_commands registered_commands
  (live: 1 pass; test_no_unregistered_commands enforces the 3-surface
  invariant per feedback_cli_subcommand_three_surface_drift).
  TRAIN-009 BLOCKER_FIXTURE_ABSENT pending §35 real-training impl
  (no val_loss to compare without gradient descent).
  All 9 TRAIN-* falsifiers now have explicit algorithm_evidence
  blocks (8× PARTIAL_ALGORITHM_LEVEL + 1× BLOCKER_FIXTURE_ABSENT) —
  the distill contract has reached terminal-binding state.

§44 documents: what landed (table), coverage flips (FALSIFY-CPU-GPU-005
PARTIAL→PARTIAL deeper, TRAIN-007/008 unbound→PARTIAL, TRAIN-009
unbound→BLOCKER), why for MODEL-1+MODEL-2 (jidoka armor complete +
distill contract terminal-bound), Five Whys, ship % effects (MODEL-1
88→89, MODEL-2 56→57), and next-session pickup options (live
FALSIFY-CPU-GPU-005 discharge OR MODEL-2 §35 real-training OR
MODEL-1 SHIP-007 GPU kernel root-cause fix).

Coverage tally: 15+35 → 15+37 (+2 PARTIAL closed; TRAIN-009 blocked).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

…p-close