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_memory/test_events.py

@@ -0,0 +1,85 @@
+from __future__ import annotations
+
+import pydantic
+import pytest
+from everalgo.types import ChatMessage, MemCell
+
+from everos.memory.events import AgentPipelineStarted, UserPipelineStarted
+
+
+def _sample_memcell() -> MemCell:
+    return MemCell(
+        items=[
+            ChatMessage(
+                id="m1",
+                role="user",
+                content="hello",
+                timestamp=1_700_000_000_000,
+                sender_id="u1",
+            ),
+            ChatMessage(
+                id="m2",
+                role="assistant",
+                content="hi back",
+                timestamp=1_700_000_001_000,
+                sender_id="agent",
+            ),
+        ],
+        timestamp=1_700_000_001_000,
+    )
+
+
+def test_user_pipeline_started_topic_is_module_qualified() -> None:
+    assert UserPipelineStarted.topic() == "everos.memory.events:UserPipelineStarted"
+
+
+def test_agent_pipeline_started_topic_is_module_qualified() -> None:
+    assert AgentPipelineStarted.topic() == "everos.memory.events:AgentPipelineStarted"
+
+
+def test_user_pipeline_started_roundtrip_json() -> None:
+    event = UserPipelineStarted(
+        memcell_id="mc_a", session_id="s1", memcell=_sample_memcell()
+    )
+    restored = UserPipelineStarted.model_validate_json(event.model_dump_json())
+    assert restored.memcell_id == "mc_a"
+    assert restored.session_id == "s1"
+
+
+def test_user_pipeline_started_is_frozen_and_extra_forbid() -> None:
+    event = UserPipelineStarted(
+        memcell_id="mc_a",
+        session_id="s1",
+        memcell=_sample_memcell(),
+    )
+    with pytest.raises(pydantic.ValidationError):
+        UserPipelineStarted(  # type: ignore[call-arg]
+            memcell_id="mc_a",
+            session_id="s1",
+            memcell=_sample_memcell(),
+            extra_field=1,
+        )
+    with pytest.raises(pydantic.ValidationError):
+        event.memcell_id = "mc_b"  # type: ignore[misc]
+
+
+def test_user_pipeline_started_carries_memcell() -> None:
+    event = UserPipelineStarted(
+        memcell_id="mc_a",
+        session_id="s1",
+        memcell=_sample_memcell(),
+    )
+    assert event.memcell.items[0].content == "hello"
+    assert event.memcell.items[1].sender_id == "agent"
+
+
+def test_user_pipeline_started_nested_roundtrip_json() -> None:
+    event = UserPipelineStarted(
+        memcell_id="mc_a",
+        session_id="s1",
+        memcell=_sample_memcell(),
+    )
+    restored = UserPipelineStarted.model_validate_json(event.model_dump_json())
+    assert restored.memcell.items[0].id == "m1"
+    assert restored.memcell.items[1].content == "hi back"
+    assert restored.memcell.timestamp == 1_700_000_001_000