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/code-style.md

@@ -0,0 +1,17 @@
+# Code style rule (always loaded)
+
+- **Formatter & linter**: `ruff` is the single tool (replaces black / isort / flake8).
+  Line length 88, target `py312`. Run `make format` to auto-fix; `make lint` checks.
+- **Active ruff rule sets**: `E F I N UP B SIM ASYNC`. Don't disable a rule inline
+  unless there's a genuine reason — prefer fixing the code.
+- **Type hints**: annotate every public function signature (params + return). The
+  codebase is ~100% typed; keep it that way.
+- **`from __future__ import annotations`** at the top of every module — annotations
+  are strings, so forward refs and `X | None` unions are free.
+- **Prefer `collections.abc`** (`Sequence`, `Mapping`) over concrete `list`/`dict`
+  in signatures; use `Protocol` for structural interfaces.
+- **No dead code**: no commented-out blocks, no unused imports, no speculative
+  abstractions. Delete rather than comment out.
+- **Naming**: `*Manager` (orchestrators), `*Provider` (injectable services),
+  `*Reader`/`*Writer` (persistence), `*Recaller` (search routes). Follow the
+  established suffix when adding a sibling.