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.

.claude/rules/testing.md

@@ -0,0 +1,27 @@
+---
+paths:
+  - "tests/**/*.py"
+---
+
+# Testing rule
+
+Tests mirror the source layout: `tests/unit/test_<layer>/...`,
+`tests/integration/...`, `tests/e2e/...`.
+
+- **Structure**: `tests/unit/` mirrors `src/everos/` package-for-package. Put a test
+  next to where its subject lives in the mirror.
+- **Async**: `pytest-asyncio` is in `auto` mode — write `async def test_*` directly,
+  no marker needed.
+- **Markers** (default run excludes both — `-m "not slow and not live_llm"`):
+  - `@pytest.mark.slow` — tests ≥ ~10s.
+  - `@pytest.mark.live_llm` — needs real LLM/embedder credentials.
+  Keep unit tests fast and credential-free; push anything needing real services
+  behind a marker or into `integration`/`e2e`.
+- **Fixtures**: shared fixtures live in the nearest `conftest.py`. The root conftest
+  resets module caches (settings/logging/datetime) per test — rely on that for
+  isolation rather than mutating globals.
+- **Module docstring** on each test file stating what contract it pins (see existing
+  tests for the style).
+- **Coverage gate**: `make cov` enforces 80% (`--cov-fail-under=80`). New code should
+  not drop coverage below the gate.
+- Run `make test` (unit) and `make integration` before pushing; both run in CI.