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/skills/pr/SKILL.md

@@ -0,0 +1,41 @@
+---
+name: pr
+description: Open a GitHub PR targeting the correct branch with the project template
+---
+
+# /pr
+
+Open a pull request on GitHub using the `gh` CLI and the repo's PR template.
+
+## Steps
+
+1. Confirm the branch and target:
+   - `feat/*`, `fix/*` → base **`dev`**.
+   - `hotfix/*` → base **`master`** (then a follow-up PR/sync into `dev`).
+2. Ensure local checks pass first:
+   ```bash
+   make ci
+   ```
+   Do not open a PR with failing lint/tests.
+3. Push the branch:
+   ```bash
+   git push -u origin HEAD
+   ```
+4. Create the PR, filling the template
+   ([.github/PULL_REQUEST_TEMPLATE.md](../../../.github/PULL_REQUEST_TEMPLATE.md)):
+   ```bash
+   gh pr create --base dev --fill-first
+   ```
+   Then edit the body to complete each section:
+   - **Summary** — what changed and why.
+   - **Area** — tick the relevant box (architecture / benchmark / use case /
+     docs / DX / CI-build-release).
+   - **Verification** — paste the commands you ran (`make ci`, manual checks).
+   - **Checklist** — tick honestly; don't tick boxes you didn't satisfy.
+   - **Notes for Reviewers** — anything subtle.
+
+## Notes
+
+- Keep the PR scoped to one area. Split unrelated changes.
+- If `make ci` was not fully run, say so in Verification rather than implying it passed.
+- A `hotfix` is not done until it has landed on **both** `master` and `dev`.