Add RTD info

Author: g-despot

docs/PUBLISHING.md

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+# Documentation Publishing
+
+How the reference docs at https://weaviate-python-client.readthedocs.io/ are built, how the `weaviate-agents-python-client` is folded in, and how to publish a staging preview for a branch.
+
+For authoring guidance (adding modules, regenerating `.rst` files, building locally), see [README.rst](./README.rst).
+
+## What publishes the docs
+
+Read the Docs (RTD), not GitHub Actions. RTD is configured to watch this repo and rebuild on every push to a tracked branch or tag. The CI workflow at `.github/workflows/main.yaml` only runs `python -m sphinx ...` as a sanity check — it never publishes anything.
+
+Project dashboard: https://readthedocs.org/projects/weaviate-python-client/
+
+## Build configuration
+
+Two files control the build:
+
+- **`.readthedocs.yaml`** — RTD build config (Python version, `pre_build` hooks, requirements file, Sphinx entry point).
+- **`docs/conf.py`** — Sphinx config (extensions, theme, autodoc behavior, docstring post-processing).
+
+Build steps RTD runs, in order:
+
+1. Spin up an Ubuntu 22.04 image with Python 3.12 (per `.readthedocs.yaml`).
+2. Run the `pre_build` hook (see next section — this is where the agents client gets pulled in).
+3. `pip install -r requirements-devel.txt`.
+4. `python -m sphinx -b html docs/ <output>` using `docs/conf.py`.
+5. Publish the HTML to `https://weaviate-python-client.readthedocs.io/en/<version-slug>/`.
+
+## How the agents client is folded in
+
+The `weaviate-agents-python-client` lives in its own repo (https://github.com/weaviate/weaviate-agents-python-client) but its API reference is published as part of the same RTD site.
+
+This is wired up in `.readthedocs.yaml` via a `pre_build` hook:
+
+```yaml
+build:
+  jobs:
+    pre_build:
+      - git clone -b main --depth=1 https://github.com/weaviate/weaviate-agents-python-client.git docs/weaviate-agents-python-client
+      - python -m pip install -e ./docs/weaviate-agents-python-client
+```
+
+And `docs/conf.py` adds the cloned directory to `sys.path`:
+
+```python
+sys.path.insert(0, os.path.abspath("weaviate-agents-python-client"))
+```
+
+Implications:
+
+- The agents docs always come from the agents repo's `main` branch — pinning to a tag would require editing `.readthedocs.yaml`.
+- Changes merged to the agents repo's `main` are **not** automatically published here. The published version updates when either (a) a new release of `weaviate-python-client` is cut, or (b) a maintainer manually triggers a rebuild from the RTD dashboard.
+- The agents repo has its own `docs/` tree (with its own `index.rst`, etc.). After cloning, RTD's Sphinx build picks up those `.rst` files because they sit under `docs/weaviate-agents-python-client/docs/`, which Sphinx walks as part of the source tree.
+
+## Publishing a staging build for a branch
+
+Add the branch as a Version in RTD:
+
+1. Open https://readthedocs.org/projects/weaviate-python-client/versions/.
+2. Click **+ Add version**, pick the branch from the dropdown (hit the refresh icon if it's not listed yet — RTD polls GitHub for new branches).
+3. Tick **Active**. Leave **Hidden** ticked if you don't want the branch to show up in the version switcher on the public site (you'll still get a direct URL).
+4. Click **Update version**. RTD kicks off a build immediately.
+
+Watch the build on the **Builds** tab. Once it succeeds, the preview is at:
+
+```
+https://weaviate-python-client.readthedocs.io/en/<branch-slug>/
+```
+
+RTD slugifies the branch name — slashes become dashes (e.g. `docs/suppress-overload-stacking` → `docs-suppress-overload-stacking`).
+
+When you're done, deactivate the version on the same page so it stops rebuilding on every push to that branch.