paper v2.37: §7 add 'Open questions and concrete next experiments'

§7 currently has only the Scope/limits/recommendation paragraph.
Adding a second paragraph that explicitly flags the Mode 2 → Mode 1
hypothesis status as an open question and proposes two concrete
falsification tests, plus a wider-scope replication path.

The new paragraph:

1. Acknowledges the Mode 2 → Mode 1 causal reading is a hypothesis,
   not a theorem, and that the parallel-failure reading is also
   formally consistent with the data.

2. Proposes a *direct* test: measure per-block forward-state-change
   content along the training trajectory and check whether per-block
   loss decrease tracks per-block credit usefulness more tightly than
   per-block cosine.

3. Proposes a *falsification* test for the downstream-of-Mode-2 reading:
   substitute the random B_l with a high-quality credit signal (sparse,
   learned, or weight-transport-restored à la Akrout 2019) at fixed
   ‖f_l‖ and check whether Mode 1 activation growth still appears. If
   yes, Mode 1 is NOT downstream of Mode 2.

4. Notes the wider-scope replication path: CIFAR-100, Tiny-ImageNet,
   architectures outside ResMLP/ViT-Mini, with a pointer to Appendix A
   as the structured configuration entry point.

This explicitly answers the reviewer question "what would falsify
your hypothesis?" without overclaiming. It positions the paper as
honest about open questions and points at concrete next steps.

Page count: 20 (unchanged) — the paragraph fit within the existing
slack.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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