Diag: surfaces `risk_stack.eval_warmup.{remaining,active,blend,
floor_*,target_*}` so the v9 defensive-warmup window is observable
in diag.jsonl. `remaining` is the counter; `blend` is the
defensive-vs-normal mix coefficient (1.0 = full defensive, 0.0 =
normal); `floor_*` reflect the LIVE override values (read AFTER the
warmup kernel ran). Pre-warmup the kernel is a no-op (remaining=-1),
so v9 train-phase diag is bit-identical to v8.
Cleanup: tightens unreachable_pub items in tests/behavioral/* and
tests/sp5_producer_unit_tests.rs (pub → pub(crate)), removes
unused_mut on 6 sp5 scratch buffers, renames unused `step` loop
counter in alpha_baseline example, and explicitly discards an
intentionally-no-op `Command::assert` in cli_integration_test.
Reduces lint count by ~25; remaining 3 dead_code warnings flag
SP15 Phase 2A behavioral scaffolding (Phase 2B never landed —
deliberate signal, not noise).
Pre-existing pearl per feedback_no_hiding: do NOT suppress these
with #[allow]; the warnings ARE the design call surface.
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