Add coderabbit configuration

  * additionally fix diagram workflow

Author: fizyk

.coderabbit.yaml

@@ -0,0 +1,27 @@
+language: en-GB
+reviews:
+  path_instructions:
+    - path: "newsfragments/*.rst"
+      instructions: |
+        Validate newsfragment files:
+        1. Read valid types from [tool.towncrier.fragment] in pyproject.toml
+        2. Filename must follow the pattern: [number].[type].rst OR +[hash].[type].rst where:
+           - [number] is an issue number or PR number
+           - [type] must be one of the types defined in towncrier configuration
+        3. Content must be a clear, concise description of the change
+        4. Content should be suitable for inclusion in CHANGES.rst
+        5. Verify the type matches the nature of the change based on towncrier type definitions
+        6. Flag any files with invalid types or malformed filenames
+        7. Check that the description is meaningful (not just "fix" or "update")
+
+  pre_merge_checks:
+    custom_checks:
+      - name: "Newsfragment Check"
+        mode: "warning"
+        instructions: |
+          Check if a newsfragment file has been added to the newsfragments/ directory.
+          Read the towncrier configuration from pyproject.toml to determine valid newsfragment types.
+          If no newsfragment is present, suggest which type should be added based on the PR changes.
+          Suggest the filename format: [issue_or_pr_number].[type].rst
+          Remind contributors to use: `pipenv run towncrier create [number].[type].rst`
+          Skip the check if the PR only updates existing newsfragments or is a trivial change.

.github/workflows/diagram.yml

@@ -17,8 +17,13 @@ jobs:
       - name: Install Mermaid CLI
         run: npm install -g @mermaid-js/mermaid-cli
 
-      - name: Render Diagram
-        run: mmdc -p docs/puppeteer-config.json -i docs/architecture.mmd -o docs/images/architecture.svg -t neutral
+      - name: Render Diagrams
+        run: |
+          mkdir -p docs/images
+          find docs -type f -name "*.mmd" -print0 | while IFS= read -r -d '' file; do
+            base="$(basename "${file}" .mmd)"
+            mmdc -p docs/puppeteer-config.json -i "${file}" -o "docs/images/${base}.svg" -t neutral
+          done
 
       - name: Commit and Push
         uses: stefanzweifel/git-auto-commit-action@v7

newsfragments/+4593101b.misc.rst

@@ -0,0 +1 @@
+Add coderabbitai configuration with instructions to keep an eye for newsfragments.

newsfragments/+ba8eaaf7.misc.rst

@@ -0,0 +1 @@
+Fixes for diagram workflow.