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.md

@@ -0,0 +1,82 @@
+# EverOS — md-first Memory Extraction Framework
+
+This is a Python framework for md-first memory extraction (lightweight; single-user or small-team).
+
+## Quick commands
+
+```bash
+uv sync                    # install deps
+make lint                  # ruff (check + format-check) + import-linter
+make format                # auto-fix formatting
+make test                  # pytest tests/unit
+make integration           # pytest tests/integration
+make ci                    # full CI: lint + test + integration
+```
+
+## Architecture
+
+DDD 5 layers + cross-cutting:
+
+```
+entrypoints  →  service  →  memory  →  infra
+                              ↓
+                        component / core / config
+```
+
+- `entrypoints/` — cli + api (Presentation)
+- `service/` — use case orchestration (memorize / retrieve / evolve / manage)
+- `memory/` — domain (extract + search + cascade + prompt_slots + models)
+- `infra/` — storage adapters (markdown + sqlite + lancedb)
+- `component/` — injectable providers (llm / embedding / config / utils)
+- `core/` — runtime base (observability / lifespan / context)
+- `config/` — configuration data (Settings + default.toml)
+
+**Dependency rule**: `entrypoints → service → memory → infra`. Single-direction, enforced by `import-linter`.
+
+Detailed: [docs/architecture.md](docs/architecture.md).
+
+## Engineering practices
+
+- **Coding rules** auto-loaded from [.claude/rules/](.claude/rules/) (10 rules; the three always-loaded ones cover architecture / code-style / language-policy, the rest are path-scoped and load when Claude Code opens a matching file)
+- **Workflows** as slash commands in [.claude/skills/](.claude/skills/) — `/commit`, `/new-branch`, `/pr`
+- **Project-level decisions** in [docs/](docs/) (low-frequency, human-judgment-required)
+- **Language policy**: the project targets a global audience — docs and code are English; CJK appears only in test fixtures and locale-suffixed mirrors. Scanned by `make check-cjk`.
+- **Datetime discipline**: never call `datetime.now()` / `time.time()` directly — use `everos.component.utils.datetime`. Enforced by `make check-datetime`.
+
+Engineering infrastructure overview: [docs/engineering.md](docs/engineering.md).
+
+## Branch strategy
+
+`master` = released stable (hidden); `dev` = integration; `feat/* fix/*` → dev; `hotfix/*` → master + dev (sync).
+
+See [docs/engineering.md](docs/engineering.md) for the full GitFlow Lite rationale.
+
+## Storage three-piece set
+
+```
+Markdown (truth)  +  SQLite (state)  +  LanceDB (vector + BM25 + scalar)
+```
+
+- Memory root: `~/.everos/{agents,users,knowledge}/` (md files = single source of truth)
+- System DB: `~/.everos/.index/sqlite/system.db` (state + audit + queue + metadata)
+- Index: `~/.everos/.index/lancedb/` (rebuildable from md)
+
+Selection rationale: [docs/architecture.md](docs/architecture.md).
+
+## Source layout
+
+**src layout** (`src/everos/<...>`): standard PyPA project structure — code lives under `src/` so the working tree is not on the import path until installed, preventing accidental imports of in-development modules.
+
+Algorithm assets (prompts, extractors) live in the separate [`everalgo`](https://github.com/EverMind-AI/EverAlgo) library, consumed here as the `everalgo-*` PyPI packages.
+
+## Where things go
+
+| Want to... | Look at |
+|---|---|
+| Understand architecture | [docs/architecture.md](docs/architecture.md) |
+| Understand storage choice | [docs/architecture.md](docs/architecture.md) (storage section) |
+| Engineering tooling overview | [docs/engineering.md](docs/engineering.md) |
+| Add a new module | [.claude/rules/init-py-and-reexport.md](.claude/rules/init-py-and-reexport.md) |
+| Make a commit | use `/commit` |
+| Open a branch / PR | use `/new-branch` / `/pr` |
+| Run checks before pushing | `make ci` |