feat: Link-Taxonomie abgeschlossen - Lint hart ab kb_version 4.0.0, outbound: an Type-Spec gebunden, part-of/composition als Inversenpaar (4.1.0, #40)

Files changed:
- CHANGES.md
- VERSION
- instructions/link-taxonomy.md
- instructions/migrations/4.0.0-link-taxonomy.md
- kb/comparisons/amd-pstate vs acpi-cpufreq.md
- kb/concepts/Episodic Memory.md
- kb/concepts/Memory Lifecycle.md
- kb/concepts/Mesh Sync.md
- kb/concepts/Procedural Memory.md
- kb/concepts/Reciprocal Rank Fusion.md
- kb/concepts/Semantic Memory.md
- kb/concepts/Shared vs Private.md
- kb/concepts/Split Threshold.md
- kb/concepts/Stub Threshold.md
- kb/concepts/Supersession.md
- kb/concepts/Typed Relationships.md
- kb/concepts/Vector Search.md
- kb/concepts/Work Coordination.md
- kb/concepts/Working Memory.md
- kb/entities/technologies/Wine-Staging.md
- kb/entities/tools/pascalandy schema.md
- kb/index.md
- kb/log.md
- kb/sources/COLLECTION.md
- tools/CONTRACT.md
- tools/chemenu/commands/lint.py
- tools/chemenu/kb_collections.py
- tools/chemenu/lint_core.py
- tools/chemenu/tests/test_conventions.py
- tools/chemenu/tests/test_lint.py
- tools/chemenu/tests/test_type_resolver.py
- types/comparison.md
- types/comparison.schema.yaml

tools/chemenu/tests/test_lint.py

@@ -1,8 +1,12 @@
 import json
 from datetime import date
 
-from chemenu import config
+import pytest
+
+from chemenu import config, kb_state
 from chemenu.commands.lint import (
+    HARD_ERROR_KEYS,
+    hard_error_keys,
     has_hard_errors,
     lint_command,
     render_markdown,
@@ -11,6 +15,8 @@ from chemenu.commands.lint import (
 )
 from chemenu.frontmatter_io import write_page
 from chemenu.provenance import cite_id, render_cite_block
+from chemenu.tests.conftest import use_shipped_type_specs
+from chemenu.version import Version
 
 
 def test_lint_detects_unparsable_frontmatter(kb_dir):
@@ -472,3 +478,83 @@ def test_lint_does_not_count_a_shell_prompt_as_a_quote(kb_dir):
     )
     report = run_lint(kb_dir)
     assert [i for i in report["quote_limit_violations"] if i["page"] == "shelly"] == []
+
+
+# --- the migration gate on `unlabelled_edges` / `unauthorised_labels` -------
+#
+# These four repoint `config.ROOT` at the fixture tree, which the `kb_dir`
+# fixture alone does not do. Two things need it: `write_kb_state()` writes
+# `.wikitool-kb.json` relative to `ROOT`, and `lint`'s collection lookup
+# resolves a page against `config.KB_DIR` rather than against the directory it
+# was handed - so without the repoint the gate would be read off the real
+# repository's state file.
+
+
+@pytest.fixture
+def rooted_kb(kb_dir, tmp_path, monkeypatch):
+    monkeypatch.setattr(config, "ROOT", tmp_path)
+    use_shipped_type_specs(monkeypatch)
+    return kb_dir
+
+
+def _page_with_an_unlabelled_edge(rooted_kb):
+    """A `related:` entry that is a bare title rather than a `label: title`
+    mapping - the shape every page was in before the 4.0.0 migration."""
+    write_page(
+        rooted_kb / "entities/tools/bare-edge.md",
+        {"type": "types/entity.md", "entity_type": "tool", "tags": [], "created": "2026-09-03",
+         "modified": "2026-09-03", "related": ["Modbus"], "sources": [], "confidence": 0.8,
+         "provenance": "general", "summary": "One edge whose label was never declared."},
+        "\n# bare-edge\n\nAn edge without a label.\n",
+    )
+
+
+def test_unlabelled_edge_is_advisory_below_kb_version_4(rooted_kb):
+    """The window the migration document describes: the machinery has landed,
+    the corpus has not been converted yet, and `lint --fail-on-error` must not
+    refuse the very tree the migration tells the instance to publish unit by
+    unit."""
+    _page_with_an_unlabelled_edge(rooted_kb)
+    kb_state.write_kb_state(Version(3, 0, 0), [])
+    report = run_lint(rooted_kb)
+    assert report["unlabelled_edges"] != []
+    assert "unlabelled_edges" not in hard_error_keys()
+    # Narrowed to the finding under test: the fixture corpus carries unrelated
+    # hard errors of its own, so asserting on the whole report would prove
+    # nothing about the gate.
+    assert has_hard_errors({"unlabelled_edges": report["unlabelled_edges"]}) is False
+
+
+def test_unlabelled_edge_is_hard_at_kb_version_4(rooted_kb):
+    """Once the migration is recorded, a bare title is no longer a page waiting
+    its turn - it is an edge whose author did not say what it asserts."""
+    _page_with_an_unlabelled_edge(rooted_kb)
+    kb_state.write_kb_state(Version(4, 0, 0), [])
+    report = run_lint(rooted_kb)
+    assert report["unlabelled_edges"] != []
+    assert "unlabelled_edges" in hard_error_keys()
+    assert has_hard_errors({"unlabelled_edges": report["unlabelled_edges"]}) is True
+
+
+def test_unauthorised_label_is_hard_at_kb_version_4(rooted_kb):
+    """The fixture contracts authorise `depends-on` but not `contradicts`."""
+    write_page(
+        rooted_kb / "entities/tools/off-menu.md",
+        {"type": "types/entity.md", "entity_type": "tool", "tags": [], "created": "2026-09-03",
+         "modified": "2026-09-03", "related": [{"contradicts": "Modbus"}], "sources": [],
+         "confidence": 0.8, "provenance": "general", "summary": "A label off this menu."},
+        "\n# off-menu\n\nA label the source collection never authorised.\n",
+    )
+    kb_state.write_kb_state(Version(4, 0, 0), [])
+    report = run_lint(rooted_kb)
+    assert report["unauthorised_labels"] != []
+    assert "unauthorised_labels" in hard_error_keys()
+    assert has_hard_errors({"unauthorised_labels": report["unauthorised_labels"]}) is True
+
+
+def test_a_tree_that_never_declared_a_kb_version_keeps_every_key(rooted_kb):
+    """No `.wikitool-kb.json` means a fresh instance, which starts at the
+    current shape rather than migrating into it - so there is no outstanding
+    migration for a gated finding to be the noise of."""
+    assert kb_state.read_kb_version() is None
+    assert hard_error_keys() == HARD_ERROR_KEYS