v3.42 black-box audit: H-1..H-5 convergence fixes for 9 v3.41 failures

[FluffyAIcode]

Scope

• SUT: scheme_b_v342.py via AgentMemorySystem.py redirect.
• Runner: v331_blackbox_eval.py, unmodified.
• Spec: V331_BLACKBOX_TEST_SPEC.md, unmodified.

v3.42 architectural changes

Tag	Target cases	Mechanism
H-1	4.7 / 4.8 / 4.10 / 4.15 / 4.17 / 4.21	content_bias / suppression_bias applied only in fwd path; shape_step_applies_*_bias=False; relevance_floor=0.30, concentration=1.5, cyclic_content_max_count=3
H-2	4.23	ContentSemanticTailHead.zero_init_tied=True; wte_residual_alpha=1.5
H-3	4.24	MemoryContextEncoder = single orthogonal Linear, no LN/SiLU
H-4	4.17	.detach().cpu().clone().contiguous() both sides of save/load; (-idf, id) tie-break
H-5	4.25	Carry-over from H-1 (A not saturated) + H-2 (slot 2+ residuals differentiated)

Audit result

• 26 cases, elapsed 1418.4 s on CPU.
• Pass: 17 / 26, Fail: 9 / 26.
• v3.41 baseline: 17 / 26 pass, 1437.7 s.

Delta vs v3.41:

Transition	Count	Cases
FAIL → PASS	1	4.8
PASS → FAIL	1	4.12
Persistent FAIL	8	4.7, 4.10, 4.15, 4.17, 4.21, 4.23, 4.24, 4.25

Net pass count unchanged. 4.8 fixed by H-1 (double-add removal). 4.12 regressed because H-2's α=1.5 residual at native WTE scale forms an attractor basin at step 0 when prompt tokens overlap with memory rare keywords — the exact trade-off documented in v3.41 §5.5 falsifiable experiment D1.

Three mutually-opposed constraints on wte_residual_alpha (4.23 wants ≥1.5, 4.12 wants ≤0.5, 4.25 wants clamp-compatible scale). No scalar α satisfies all three simultaneously on this corpus.

Other structural observations:

• 4.23 succeeds structurally (tail slot direction now deterministic = rare-keyword centroid) but top-3 intersection criterion not met.
• 4.24 now passes space gap (0.152 ≥ 0.15) but music gap went negative (−0.084) — small-corpus sample variance.
• 4.25 first condition unchanged (A saturated); second condition now fails (slot_norm_ratio=0.784 < 0.85) due to H-2's larger residual consuming clamp budget.
• 4.17 unchanged — non-determinism is deeper than save/load serialization.

Artifacts

• reports/v342_blackbox/report.json
• reports/v342_blackbox/report.md
• reports/v342_blackbox/runner.log
• reports/v342_blackbox/audit_feedback.md (Section 7 compliant)