chore: add qsl compat metadata and compatibility tests (#25)

Co-authored-by: Codex <noreply@openai.com>

Author: Pigbibi

qsl.toml

@@ -0,0 +1,9 @@
+[qsl]
+repo = "ResearchSignalContextPipelines"
+tier = "research"
+ring = 2
+allow_legacy = false
+snapshot_contract = "docs/architecture.md"
+
+[qsl.compat]
+bundle = "2026.07.0"

tests/test_qsl_metadata.py

@@ -0,0 +1,20 @@
+"""Minimal QSL compat metadata smoke tests."""
+
+from __future__ import annotations
+
+from pathlib import Path
+import tomllib
+
+
+def test_qsl_metadata_has_compat_bundle() -> None:
+    path = Path(__file__).resolve().parents[1] / "qsl.toml"
+    with path.open("rb") as f:
+        data = tomllib.load(f)
+
+    qsl = data["qsl"]
+    assert qsl["tier"] == "research"
+    assert qsl["ring"] == 2
+    assert qsl.get("repo") == "ResearchSignalContextPipelines"
+    compat = qsl["compat"]
+    assert compat["bundle"] == "2026.07.0"
+    assert qsl.get("snapshot_contract") == "docs/architecture.md"