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.

tests/unit/test_memory/test_prompt_slots/test_loader.py

@@ -0,0 +1,61 @@
+"""``PromptLoader.load`` — returns template iff enabled + non-empty."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from everos.memory.prompt_slots.loader import PromptLoader
+
+
+def _write_slot(root: Path, name: str, content: str) -> None:
+    slot_dir = root / "prompt_slots"
+    slot_dir.mkdir(parents=True, exist_ok=True)
+    (slot_dir / f"{name}.yaml").write_text(content)
+
+
+def test_returns_none_when_file_missing(tmp_path: Path) -> None:
+    loader = PromptLoader(tmp_path)
+    assert loader.load("boundary_detection") is None
+
+
+def test_returns_none_when_disabled(tmp_path: Path) -> None:
+    _write_slot(tmp_path, "x", "enabled: false\ntemplate: 'hello'\n")
+    loader = PromptLoader(tmp_path)
+    assert loader.load("x") is None
+
+
+def test_returns_none_when_enabled_key_absent(tmp_path: Path) -> None:
+    _write_slot(tmp_path, "x", "template: 'hello'\n")
+    loader = PromptLoader(tmp_path)
+    assert loader.load("x") is None
+
+
+def test_returns_none_when_template_empty(tmp_path: Path) -> None:
+    _write_slot(tmp_path, "x", "enabled: true\ntemplate: ''\n")
+    loader = PromptLoader(tmp_path)
+    assert loader.load("x") is None
+
+
+def test_returns_none_when_template_whitespace(tmp_path: Path) -> None:
+    _write_slot(tmp_path, "x", "enabled: true\ntemplate: '   '\n")
+    loader = PromptLoader(tmp_path)
+    assert loader.load("x") is None
+
+
+def test_returns_none_when_template_missing(tmp_path: Path) -> None:
+    _write_slot(tmp_path, "x", "enabled: true\n")
+    loader = PromptLoader(tmp_path)
+    assert loader.load("x") is None
+
+
+def test_returns_template_when_enabled_and_non_empty(tmp_path: Path) -> None:
+    _write_slot(tmp_path, "x", "enabled: true\ntemplate: 'detect now'\n")
+    loader = PromptLoader(tmp_path)
+    assert loader.load("x") == "detect now"
+
+
+def test_template_must_be_string(tmp_path: Path) -> None:
+    """Non-string ``template`` (e.g. accidental int) is treated as None."""
+    _write_slot(tmp_path, "x", "enabled: true\ntemplate: 42\n")
+    loader = PromptLoader(tmp_path)
+    assert loader.load("x") is None