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/module-docstring.md

@@ -0,0 +1,35 @@
+---
+paths:
+  - "src/everos/infra/**/*.py"
+  - "src/everos/memory/**/*.py"
+  - "src/everos/service/**/*.py"
+  - "src/everos/component/**/*.py"
+  - "src/everos/core/**/*.py"
+---
+
+# Module docstring rule
+
+Every non-trivial module in the domain/infra layers opens with a docstring that
+explains **intent and contract**, not just a one-line label.
+
+A good module docstring states:
+
+- **What** the module is responsible for (one sentence).
+- **The load-bearing invariants** — the rules a reader must know to change it
+  safely (partition keys, what is/isn't written, defaults, ignored flags).
+- **External usage** when the module is a package facade (a short import example).
+
+Example (abbreviated, from `memory/search/manager.py`):
+
+```python
+"""SearchManager — top-level orchestrator for POST /api/v1/memory/search.
+
+Hard partition by owner_type: user → episodes (+ profiles), agent →
+agent_cases + agent_skills. The manager never writes to storage; it only
+reads LanceDB + markdown.
+"""
+```
+
+Prefer prose that would save the next engineer a debugging session over
+boilerplate. If a module is genuinely trivial (a 3-line constant), a one-liner
+is fine — but most modules here are not.