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/core/persistence/markdown/parsed.py

@@ -0,0 +1,31 @@
+"""Parsed-markdown data type.
+
+The output shape of :class:`MarkdownReader` is held here, separate
+from the reader implementation: callers that only consume parse
+results don't need to import the reader machinery, and downstream
+modules (writer, business readers) can produce :class:`ParsedMarkdown`
+without going through ``MarkdownReader.read`` if they already hold
+the pieces.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+from .entries import Entry
+
+
+@dataclass(frozen=True)
+class ParsedMarkdown:
+    """A markdown document after parsing.
+
+    Attributes:
+        frontmatter: Parsed YAML mapping (empty dict if no frontmatter block).
+        body: Document text after the frontmatter block; not entry-stripped.
+        entries: Marker-delimited entries discovered inside ``body``.
+    """
+
+    frontmatter: dict[str, Any]
+    body: str
+    entries: list[Entry] = field(default_factory=list)