Initialize portable AtomHMI project knowledge and handoff

PROJECT.md

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+# AtomHMI UI project
+
+## Purpose
+Use AtomHMI's graphical web interface to create and modify pages. Keep durable project knowledge in this repository so work can continue from another computer.
+
+## Knowledge location
+This repository is the shared home for project instructions, confirmed facts, and current handoff notes. It is not currently an application source checkout.
+
+## Files
+- AGENTS.md: instructions for assistants working on the project.
+- PROJECT.md: durable project facts and decisions.
+- HANDOFF.md: current progress and next actions.
+
+## Established preferences
+- Prefer graphical editing within AtomHMI for page work.
+- Preserve project knowledge remotely rather than depending on one computer.
+- Use the connected Atom Git plugin to read and update this repository.
+
+## Details still needed
+- Target AtomHMI URL and environment.
+- Target page and desired changes.
+- Page editor workflow and available backup/export features.
+- Validation and publication requirements for the target environment.