feat(cli): extract Obelisk runtime into npm package

Add @obelisk-apps/cli with the existing build, search, query, and attune contract plus official skill installation.

Separate the docs-only skill artifact, bootstrap installer, release layout, cross-platform CI, and package-level regression coverage.

packages/core/src/tx.ts

@@ -1,6 +1,6 @@
 // Binding-agnostic SQLite write plumbing shared from the Core package
 // (docs/adr/0006). The injected db must expose `exec(sql)`; this works for both
-// node:sqlite (skill/CLI) and better-sqlite3 (app), same injection model as
+// node:sqlite (CLI) and better-sqlite3 (app), same injection model as
 // `persist`.
 
 export interface WriteTxDb {