Add cran-comments.md

.Rbuildignore

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 ^ref$
 ^tasks$
 ^inst/tinytest/fixtures$
+^cran-comments\.md$

cran-comments.md

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+## Test environments
+
+* Ubuntu 24.04 (local), R 4.6.x: R CMD check --as-cran
+* Windows 10, R 4.6.0 (full test suite against installed torch backend)
+* Windows 10, R-devel (2026-07-21 r90286), torch installed without its
+  lantern backend (tests skip gracefully)
+* win-builder, R-devel (2026-07-22 r90289)
+
+## R CMD check results
+
+0 errors | 0 warnings | 1 note
+
+* New submission (checking CRAN incoming feasibility).
+
+The local Linux check additionally shows a NOTE from the torch
+package's own load hook in check subprocesses ("could not find
+function packageName"); it does not reproduce on any Windows check or
+win-builder and is attributable to the local torch build, not this
+package.
+
+## Notes for the reviewers
+
+* Model weights are never bundled and never downloaded without
+  consent: every download function prompts interactively with the
+  size stated, and non-interactive sessions require
+  options(diffuseR.consent = TRUE). Weights land under
+  tools::R_user_dir("diffuseR", "data").
+* torch is in Imports; all tests, examples, and vignette code degrade
+  gracefully when torch's backend (lantern) is not installed, as on
+  win-builder.