Add portable ATVM skill and hardware prep docs

skills/atvm/references/workflow-conventions.md

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+# ATVM Workspace Conventions
+
+## File Roles
+- `guide.md`
+  - authoritative workflow rules, defaults, and checklists
+- `examples.md`
+  - reusable command examples only
+- `run-learnings.md`
+  - dated lessons captured only when a run produced a new lasting insight
+- `inventory/*.md`
+  - durable environment reference and listings
+- `archive/imported-notes/*.md`
+  - preserved source material kept for completeness and traceability
+
+## Update Policy
+- Update `docs/setup/guide.md` when setup/bootstrap workflow behavior changes.
+- Update `docs/automation/guide.md` when automation workflow behavior changes.
+- Update `docs/automation/examples.md` when a reusable example pattern changes.
+- Update `run-learnings.md` files only when a run created a new lesson worth preserving.
+- Keep inventory details in `inventory/` rather than mixing them into workflow guides.
+
+## Path Conventions
+- Prefer actual repo paths under `/home/aw/code/cds/atvm/...` in documentation.
+- Keep top-level navigation in `README.md` and `AGENTS.md`.
+- Keep executable assets under `scripts/`.
+
+## Archive Policy
+- Preserve imported long-form notes under `archive/imported-notes/`.
+- Do not rely on archived notes as the primary operational runbook when a current guide exists.
+- Keep detailed listings available; reorganization should improve navigation, not remove information.