docs: add coding-agent Community PR steps

README.md

@@ -147,6 +147,36 @@ upload with `--revision refs/pr/N` (do not pass `--create-pr` again).
 Merge is on the
 [Community tab](https://huggingface.co/datasets/bobleesj/quantem-data/discussions).
 
+### Coding agents
+
+A coding agent can open the Community pull request. The human creates the
+Write token and attests permission. The agent does not invent
+`permission.*`, `sampling`, or optics. The agent does not run
+`hf auth login` (that prompt is interactive). The agent does not write the
+token into a repository file.
+
+```bash
+# human already ran `hf auth login` or exported HF_TOKEN (Write)
+hf auth whoami
+hf download bobleesj/quantem-data --repo-type dataset \
+  --include "check_meta/**" --include "templates/meta.json" \
+  --local-dir ./quantem-data-tools
+export PYTHONPATH="$PWD/quantem-data-tools${PYTHONPATH:+:$PYTHONPATH}"
+python -m check_meta ./gold-512-bin4
+hf upload bobleesj/quantem-data ./gold-512-bin4 \
+  widget-tutorials/show4dstem/gold-512-bin4/full \
+  --repo-type dataset --create-pr \
+  --commit-message "add show4dstem gold-512-bin4 full tutorial data"
+```
+
+`hf auth whoami` must print a username. If it fails or `--create-pr`
+returns 403, stop and ask the human for a Write token (`export HF_TOKEN=...`).
+If `python -m check_meta` is not `ok`, stop. After the upload, give the
+human the Community URL. Do not merge.
+
+Copyable widget prompt:
+[Add tutorial data](https://github.com/electronmicroscopy/quantem.widget/blob/main/docs/agent-prompts.md#add-tutorial-data-hugging-face-pull-request).
+
 If a notebook should call `quantem.widget.datasets`, open a GitHub PR after
 this one merges:
 [Contribute tutorial data](https://github.com/electronmicroscopy/quantem.widget/blob/main/docs/tutorials/contribute_data.md).