chore: initialize EverOS 1.0.0

md-first memory extraction framework for AI agents.

Markdown is the single source of truth; SQLite holds state and LanceDB
provides the rebuildable vector + BM25 + scalar index. The codebase follows
a single-direction DDD layering (entrypoints -> service -> memory -> infra,
with component / core / config cross-cutting) enforced by import-linter.

Engineering surface:
- Coding conventions in .claude/rules/ (path-scoped) and workflows in
  .claude/skills/ (/commit, /new-branch, /pr).
- GitHub Actions CI runs make lint + test + integration; pre-commit mirrors
  the gates locally (ruff, hygiene hooks, gitlint commit-msg).
- Commit messages follow Conventional Commits, enforced by gitlint.
- make lint also enforces datetime two-zone discipline and OpenAPI drift.

tests/unit/test_service/test_memorize_factories.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+import importlib
+from pathlib import Path
+
+import pytest
+
+from everos.infra.ome.engine import OfflineEngine
+
+# everos.service.__init__ re-exports `memorize` as a function attribute on
+# the package, which shadows the submodule when using `import ... as svc`.
+# importlib.import_module bypasses that shadowing and returns the real module.
+_svc = importlib.import_module("everos.service.memorize")
+
+
+async def test_get_engine_returns_singleton(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    from everos.core.persistence import MemoryRoot
+
+    monkeypatch.setattr(
+        MemoryRoot, "default", classmethod(lambda cls: MemoryRoot(root=tmp_path))
+    )
+    monkeypatch.setattr(_svc, "_ome_engine", None, raising=False)
+
+    engine1 = _svc._get_engine()
+    engine2 = _svc._get_engine()
+    assert isinstance(engine1, OfflineEngine)
+    assert engine1 is engine2
+
+
+async def test_get_user_pipeline_injects_engine(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    from everos.core.persistence import MemoryRoot
+
+    monkeypatch.setattr(
+        MemoryRoot, "default", classmethod(lambda cls: MemoryRoot(root=tmp_path))
+    )
+    monkeypatch.setattr(_svc, "_ome_engine", None, raising=False)
+    monkeypatch.setattr(_svc, "_user_pipeline", None, raising=False)
+    monkeypatch.setattr(_svc, "get_llm_client", lambda: object())
+
+    pipeline = _svc._get_user_pipeline()
+    assert pipeline._engine is _svc._get_engine()