diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 529f85f..89d9775 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -28,12 +28,12 @@ HomeRacker is a modular 3D-printable rack-building system. Core components use p
   - Every code change that adds, modifies, or removes functionality **must** include a documentation update.
   - Follow the What / Why / How / References structure defined in the markdown instructions.
   - When renaming or restructuring code, update or rename the associated docs to keep everything tidy.
-  - When adding or modifying model parts (`parts/*.scad`), **generate preview PNGs** with `cmd/export/export-png.sh` and update both the model's README 📸 Catalog and the parent `models/README.md` index.
-- **Assets Policy**: All manually-created images (photos, diagrams, logos, MakerWorld description images) are hosted in [`kellerlabs/assets`](https://github.com/kellerlabs/assets). Push directly to its `main` branch. Reference via `https://raw.githubusercontent.com/kellerlabs/assets/main/<repo>/<path>`. Only auto-generated render PNGs (`**/renders/*.png`) are tracked in source repos. See [ADR-001](docs/decisions/ADR-001-image-hosting-assets-repo.md).
+  - When adding or modifying model parts (`parts/*.scad`), **generate preview PNGs** with `scadm export-png` and update both the model's README 📸 Catalog and the parent `models/README.md` index.
+- **Assets Policy**: All manually-created images (photos, diagrams, logos, MakerWorld description images) are hosted in [`kellerlabs/assets`](https://github.com/kellerlabs/assets). Push directly to its `main` branch. Reference via `https://raw.githubusercontent.com/kellerlabs/assets/main/<repo>/<path>`. Only auto-generated render PNGs (`**/renders/*.png`) are tracked in source repos. See [image-hosting-assets-repo](https://github.com/kellerlabs/homeracker/blob/main/docs/decisions/image-hosting-assets-repo.md).
 - **Architecture Decision Records (ADRs)**:
-  - When the user makes an architectural or design decision during a session, create an ADR in `docs/decisions/`.
-  - Format: `ADR-NNN-<slug>.md`, numbered sequentially.
-  - Cross-link the ADR from related docs (READMEs, instructions, other ADRs) where viable.
+  - When the user makes an architectural or design decision during a session, create a decision record in `docs/decisions/`.
+  - Format: `kebab-case-title.md` (no numeric prefixes).
+  - Cross-link from related docs (READMEs, instructions, other decisions) where viable.
 - **Commits**: Use [Conventional Commits](https://www.conventionalcommits.org/) format
   - Types: `feat`, `fix`, `docs`, `chore`, `refactor`, `test`
   - Format: `type(scope): description` or `type: description`
diff --git a/.github/instructions/markdown.instructions.md b/.github/instructions/markdown.instructions.md
index 4dd5fef..46c4f26 100644
--- a/.github/instructions/markdown.instructions.md
+++ b/.github/instructions/markdown.instructions.md
@@ -68,7 +68,7 @@ How to use/customize the model:
 
 ## 📸 Catalog
 
-Preview images for each part. Generate with `export-png.sh`:
+Preview images for each part. Generate with `scadm export-png`:
 
 | Part | Preview |
 |------|---------|
@@ -78,7 +78,7 @@ Preview images for each part. Generate with `export-png.sh`:
 
 To generate or refresh previews:
 
-  ./cmd/export/export-png.sh models/<name>/parts/<part>.scad
+  scadm export-png models/<name>/parts/<part>.scad
 
 ## 📚 References
 
@@ -87,7 +87,7 @@ To generate or refresh previews:
 ```
 
 > - The 📸 Catalog section must list **every** `.scad` file under `parts/` (or the model's main `.scad` for flat models) with a preview PNG.
-> - PNGs are generated by `cmd/export/export-png.sh` and stored next to their source `.scad` file.
+> - PNGs are generated by `scadm export-png` and stored next to their source `.scad` file.
 > - When adding or modifying a parts file, **always** generate/refresh its PNG and update the Catalog table.
 > - When adding a new model or part, also update the parent `models/README.md` index with a description and preview image.
 
diff --git a/.github/instructions/openscad.instructions.md b/.github/instructions/openscad.instructions.md
index 24c61a4..46d8193 100644
--- a/.github/instructions/openscad.instructions.md
+++ b/.github/instructions/openscad.instructions.md
@@ -36,6 +36,6 @@ applyTo: "**/*.scad"
 
 ## Preview PNGs
 
-- When adding or modifying a parts file, **generate a preview PNG** with `cmd/export/export-png.sh`.
+- When adding or modifying a parts file, **generate a preview PNG** with `scadm export-png`.
 - PNGs are stored in a `renders/` subfolder next to their source (e.g., `parts/foo.scad` → `parts/renders/foo.png`).
 - Update the model's README 📸 Catalog table and the `models/README.md` index accordingly.