fix: Testisolation - kb_dir repointet config.ROOT, lint loest Kollektionen gegen den uebergebenen Baum auf (4.1.1, #44)

Files changed:
- CHANGES.md
- VERSION
- instructions/dev/testing-conventions.md
- tools/chemenu/lint_core.py
- tools/chemenu/tests/conftest.py
- tools/chemenu/tests/test_hermetic_env.py
- tools/chemenu/tests/test_lint.py

tools/chemenu/lint_core.py

@@ -165,9 +165,15 @@ def run_lint(kb_dir: Path) -> dict:
     # propagated, a deleted page, or a URL pasted where a title belongs - used
     # to pass every check. Which fields hold page titles is declared by each
     # type-spec's `page_ref_fields:`, not hardcoded here.
+    # Resolved against the directory `run_lint()` was handed, not against
+    # `config.KB_DIR`. A page under a tree that is not the configured corpus -
+    # every fixture tree, and any `lint <path>` aimed elsewhere - raised
+    # `ValueError` here and read as "no collection", which made the label
+    # authorisation below skip the edge in silence rather than judge it
+    # (Gitea #44).
     def _collection_of(page):
         try:
-            return page.path.relative_to(config.KB_DIR).parts[0]
+            return page.path.relative_to(kb_dir).parts[0]
         except (ValueError, IndexError):
             return None
 
@@ -211,7 +217,9 @@ def run_lint(kb_dir: Path) -> dict:
                 destination = _collection_of(target_page)
                 if destination is None:
                     continue
-                allowed = kb_collections.authorised_labels(source_collection, destination)
+                allowed = kb_collections.authorised_labels(
+                    source_collection, destination, kb_dir
+                )
                 if edge.label not in allowed:
                     unauthorised_labels.append(
                         {