refactor: rename package directory fabledscryer → roundtable

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

roundtable/core/migrations.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+from pathlib import Path
+
+
+def get_core_head() -> str:
+    """Return the current head revision ID of the core migration scripts.
+
+    Called at migration authoring time (when running ``alembic revision``),
+    not at application runtime. The returned ID should be captured statically
+    in a plugin's ``depends_on`` field.
+    """
+    from alembic.config import Config
+    from alembic.script import ScriptDirectory
+
+    migrations_dir = Path(__file__).parent.parent / "migrations"
+    cfg = Config()
+    cfg.set_main_option("script_location", str(migrations_dir))
+    script = ScriptDirectory.from_config(cfg)
+    heads = script.get_heads()
+    if len(heads) != 1:
+        raise RuntimeError(
+            f"Expected exactly 1 core migration head, got {len(heads)}: {heads}"
+        )
+    return heads[0]