ci(coderabbit): make Docstring Coverage advisory

.coderabbit.yaml

@@ -0,0 +1,29 @@
+# yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json
+#
+# CodeRabbit configuration. Only the settings that differ from CodeRabbit's defaults
+# are listed here; everything else stays at the default.
+#
+# inheritance: without this, a repository .coderabbit.yaml is the sole config source and
+# REPLACES any organization/UI settings (the docstring ERROR gate itself lives in the UI,
+# since the YAML default is `warning`). Enabling inheritance keeps every UI/org setting —
+# path filters, request_changes_workflow, custom checks — and only overrides the one value
+# defined below, so this change stays scoped to docstrings.
+inheritance: true
+reviews:
+  pre_merge_checks:
+    # Docstring Coverage measures a single coverage percentage across a PR's changed files
+    # and cannot be scoped per-path (the only path mechanism, reviews.path_filters, would
+    # drop the files from the whole review rather than from just this metric).
+    #
+    # This repository holds no Go — or any other docstring-bearing — production code: it is
+    # declarative org configuration (deploy/**.yaml), workflow templates, docs and a bash
+    # test script. So the metric has nothing to measure here and reports 0.00% against an
+    # 80% threshold, blocking merges on a documentation gap that does not exist (e.g. #103,
+    # whose only failed pre-merge check was Docstring Coverage 0.00% on a changeset of YAML
+    # manifests, a bash test and Markdown).
+    #
+    # Keep the check as an advisory WARNING — CodeRabbit still reports coverage — instead of
+    # a hard merge ERROR. Mirrors devantler-tech/ksail#6145, which made the same change for
+    # the same un-scopeable-metric reason.
+    docstrings:
+      mode: warning