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.

src/everos/infra/persistence/markdown/mds/__init__.py

@@ -0,0 +1,40 @@
+"""Business markdown frontmatter schemas (mds = "markdown schemas").
+
+Each business record kind that is stored as markdown gets a concrete
+frontmatter class here, subclassing one of the chassis classes from
+:mod:`everos.core.persistence.markdown`:
+
+    * :class:`UserScopedFrontmatter` for user-track records
+    * :class:`AgentScopedFrontmatter` for agent-track records
+    * :class:`BaseFrontmatter` for scope-agnostic records (rare)
+
+Schemas drive path resolution via ClassVars; each storage strategy has
+its own conventions:
+
+- **Daily-log** schemas declare ``ENTRY_ID_PREFIX`` (token in
+  ``<prefix>_<date>_<seq>``), ``DIR_NAME`` (sub-directory under
+  ``<scope>/<id>/``) and ``FILE_PREFIX`` (leading token of the daily
+  filename joined with ``-<YYYY-MM-DD>.md``).
+- **Skill** schemas (:class:`AgentSkillFrontmatter`) pin the directory
+  layout via five ``SKILL_*`` ClassVars (container / dir prefix /
+  main filename / references / scripts).
+- **Profile** schemas declare ``PROFILE_FILENAME`` (``"user.md"`` /
+  ``"agent.md"`` / …) and inherit ``SCOPE_DIR`` from a scope mixin; no
+  profile base class — the writer/reader pair is duck-typed.
+"""
+
+from .agent_case import AgentCaseDailyFrontmatter as AgentCaseDailyFrontmatter
+from .agent_skill import AgentSkillFrontmatter as AgentSkillFrontmatter
+from .atomic_fact import AtomicFactDailyFrontmatter as AtomicFactDailyFrontmatter
+from .episode import EpisodeDailyFrontmatter as EpisodeDailyFrontmatter
+from .foresight import ForesightDailyFrontmatter as ForesightDailyFrontmatter
+from .profile import UserProfileFrontmatter as UserProfileFrontmatter
+
+__all__ = [
+    "AgentCaseDailyFrontmatter",
+    "AgentSkillFrontmatter",
+    "AtomicFactDailyFrontmatter",
+    "EpisodeDailyFrontmatter",
+    "ForesightDailyFrontmatter",
+    "UserProfileFrontmatter",
+]