feat: markdown import splits H2 leafs in Go (#26)

Drop the Python ExecFile wrapper. Conversion still does not write
Ladybug; add a dry-run fixture check for the index adapter split.

bin/tools/test_bin_layout.py

@@ -125,8 +125,28 @@ class BinLayoutTest(unittest.TestCase):
             "index_mail must point at bin/brain/index.go",
         )
 
-    def test_markdown_import_is_shebang(self) -> None:
+    def test_markdown_import_is_go_not_python_exec(self) -> None:
         self._assert_shebang("bin/markdown/import.go")
+        text = (ROOT / "bin" / "markdown" / "import.go").read_text()
+        self.assertNotIn("ExecFile", text)
+        self.assertNotIn("cmdbin", text)
+        self.assertIn("internal/mdleaves", text)
+        self.assertNotIn("kb.lbug", text)
+
+    def test_import_adapters_do_not_write_ladybug(self) -> None:
+        for rel in (
+            "bin/mail/import.go",
+            "bin/mail/import",
+            "bin/markdown/import.go",
+            "bin/chats/import.go",
+            "bin/git/import.go",
+        ):
+            text = (ROOT / rel).read_text()
+            self.assertNotIn("upsert_leaf", text, rel)
+            self.assertNotIn("kb.lbug", text, rel)
+            self.assertNotIn("var/brain.lbug", text, rel)
+        index = (ROOT / "bin" / "brain" / "index.go").read_text()
+        self.assertIn("bin/kb/index", index)
 
     def test_postgres_query_is_shebang(self) -> None:
         self._assert_shebang("bin/postgres/query.go")

bin/tools/test_index_adapters.py

@@ -0,0 +1,41 @@
+"""Import adapters write files only. Index rebuild is brain/index (D14 / Gitea #7)."""
+from __future__ import annotations
+
+import json
+import os
+import subprocess
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+class IndexAdapterTest(unittest.TestCase):
+    def test_dry_run_fixture_corpus_does_not_write_lbug(self) -> None:
+        tmp = Path(tempfile.mkdtemp())
+        (tmp / "note.md").write_text("# Fixture\n\n## Leaf\n\nhello corpus\n", encoding="utf-8")
+        lbug = tmp / "kb.lbug"
+        try:
+            import ladybug  # noqa: F401
+        except ImportError:
+            venv_py = ROOT / ".venv" / "bin" / "python"
+            if not venv_py.is_file():
+                self.skipTest("ladybug missing")
+            py = str(venv_py)
+        else:
+            py = sys.executable
+        proc = subprocess.run(
+            [py, str(ROOT / "bin" / "kb" / "index"), "--dry-run", "--json", "--corpus", str(tmp)],
+            cwd=ROOT,
+            capture_output=True,
+            text=True,
+            env=os.environ.copy(),
+            check=False,
+        )
+        self.assertEqual(proc.returncode, 0, proc.stderr)
+        msg = json.loads(proc.stdout)
+        self.assertTrue(msg.get("dry_run"))
+        self.assertGreaterEqual(msg.get("corpus_total", 0), 1)
+        self.assertFalse(lbug.exists(), "dry-run must not create a Ladybug file")