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_infra/test_ome/test_exceptions.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from everos.infra.ome.events import BaseEvent
+from everos.infra.ome.exceptions import (
+    EmitNotDeclaredError,
+    OMEError,
+    StartupValidationError,
+)
+
+
+class _UnknownEvent(BaseEvent):
+    pass
+
+
+def test_ome_error_is_base_exception() -> None:
+    assert issubclass(OMEError, Exception)
+
+
+def test_startup_validation_error_inherits_ome_error() -> None:
+    assert issubclass(StartupValidationError, OMEError)
+
+
+def test_emit_not_declared_error_inherits_ome_error() -> None:
+    assert issubclass(EmitNotDeclaredError, OMEError)
+
+
+def test_emit_not_declared_carries_strategy_and_event() -> None:
+    ev = _UnknownEvent()
+    err = EmitNotDeclaredError(strategy="cluster_memcells", event=ev)
+    assert err.strategy == "cluster_memcells"
+    assert err.event is ev
+    assert "_UnknownEvent" in str(err)
+    assert "cluster_memcells" in str(err)
+
+
+def test_startup_validation_carries_message() -> None:
+    err = StartupValidationError("missing trigger.on")
+    assert "missing trigger.on" in str(err)