docs: close ReDiffuse STL-10 bounded scout

[DeliciousBuding]

Summary

• record the bounded ReDiffuse DDPM/STL-10 scout result
• close the short-target fixed-timestep denoising-loss line after random-level metrics
• reset Research slots to no active GPU question / no next GPU candidate

Checks

• git diff --check
• python -X utf8 scripts/check_public_surface.py
• python -X utf8 scripts/check_markdown_links.py
• python -X utf8 scripts/export_admitted_evidence_bundle.py --check
• python -X utf8 scripts/run_pr_checks.py

[gemini-code-assist]

Code Review

This pull request documents the results of the ReDiffuse STL-10 bounded scout conducted on 2026-05-25. The scout produced a random-level membership signal (AUC ≈ 0.5), leading to the decision to transition the research line to a "hold-weak" status and halt further GPU resource expansion. Documentation across the repository, including the roadmap, agent state, and reproduction status, has been updated to reflect these findings, and a new evidence file details the run artifacts and metrics. Feedback was provided regarding a track classification inconsistency where ReDiffuse is listed under Black-box in the workspace index but Gray-box elsewhere.

[gemini-code-assist]

The ReDiffuse research line (including the STL-10 bounded scout and the collaborator Stable Diffusion artifacts) is classified under the Black-box track in this table, but it is consistently listed as Gray-box ReDiffuse in docs/evidence/reproduction-status.md (line 75). To maintain structural consistency across the documentation, these documents and their corresponding summary text should be moved to the Gray-box track row (line 311).