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/language-policy.md

@@ -0,0 +1,12 @@
+# Language policy rule (always loaded)
+
+The project targets a global audience and is **English-first**.
+
+- **Code, comments, docstrings, docs, commit messages, identifiers**: English only.
+- **CJK characters are allowed only in**:
+  - test fixtures under `tests/` and `data/` (multilingual input is the point), and
+  - locale-suffixed mirror files (e.g. `*_zh.json`).
+- Do **not** introduce CJK into `src/`, `docs/`, or config.
+
+Enforcement: `make check-cjk` scans for stray CJK outside the allowlist (advisory).
+Keep user-facing strings and error messages in English.