Add CLAUDE.md and Claude slash commands for common workflows

.claude/commands/test.md

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+Run the full Sphinx documentation build and test suite using `./run_tests.sh` (or a specific project if one is provided as an argument, e.g. `/test en_us/course_authors/`).
+
+Identify an appropriate virtualenv and source it before running. If an appropriate virtualenv is not found, be sure to prompt the user to either select / enter an appropriate virtualenv, create a new virtualenv, or have you install the requirements globally (not advised) before running.
+
+After the build completes:
+
+1. Report the total Sphinx error and warning counts clearly to the user.
+2. Read the `test_root/<project>/err.log` files for any project that failed to get the full warning/error detail.
+3. If there are **no errors or warnings**, confirm the build is clean and ready to push.
+4. If there **are** errors or warnings:
+   - List each one with its file path and line number.
+   - For each issue, either:
+     - **Fix it automatically** if it is straightforward (e.g. title overline too short, trailing whitespace, malformed RST directives), then re-run the tests to confirm the fix works.
+     - **Explain how to fix it manually** if it requires editorial judgment (e.g. broken cross-references pointing to missing content, ambiguous section structure).
+   - After attempting all auto-fixes, re-run the tests and report the final result.

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Repository Status
+
+This is an organizational fork of the upstream edx-documentation repository. While the upstream is deprecated, this fork is actively maintained to keep documentation up to date for our organization.
+
+## Common Commands
+
+```bash
+# Install Python dependencies
+make requirements
+
+# Build all documentation projects (runs tests)
+./run_tests.sh
+
+# Build a single documentation project
+./run_tests.sh en_us/developers/
+
+# Start live-reload development server for a project
+pip install -r shared/tools.txt
+./develop.sh en_us/developers/ [port]   # Default port: 9090
+
+# Update/recompile Python requirements
+make upgrade
+
+# Clean build artifacts
+make clean
+
+# Create translation files for Transifex
+make i18n
+```
+
+## Architecture
+
+This is a **Sphinx-based static documentation site** using reStructuredText (RST) source files. There is no application code — only documentation content and build configuration.
+
+**Technology stack:**
+- Markup: reStructuredText (RST)
+- Build: Sphinx with `sphinx-book-theme`
+- Hosting: Read the Docs (docs.edx.org)
+- Translations: Transifex (only 3 projects: edx_students, open_edx_course_authors, open_edx_release_notes)
+- CI: GitHub Actions (`.github/workflows/build.yml`) — builds on push to `master` and PRs
+
+**Project layout:**
+
+Each of the 13 documentation projects lives under `en_us/<project_name>/` with standard Sphinx structure:
+```
+en_us/<project>/
+├── Makefile
+└── source/
+    ├── conf.py
+    └── index.rst + content .rst files
+```
+
+**Shared configuration** in `shared/conf.py` and `shared/edxconf.py` is imported by individual project `conf.py` files.
+
+**Build behavior:** `run_tests.sh` builds all projects in nit-picky Sphinx mode (`-n`) with 4 parallel workers. Warnings and errors are written to log files in `test_root/` via `-w`, then parsed — a build with any Sphinx warnings or errors is considered a failure.
+
+**PR requirements:** Run `./run_tests.sh` without warnings or errors before submitting. PRs require SME, product, and partner support sign-off per `.github/PULL_REQUEST_TEMPLATE.md`.