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/cli/scripts/build.mjs

@@ -0,0 +1,19 @@
+import { execFileSync } from 'node:child_process';
+import { copyFileSync, mkdirSync, rmSync } from 'node:fs';
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const cliRoot = resolve(dirname(fileURLToPath(import.meta.url)), '..');
+const repoRoot = resolve(cliRoot, '../..');
+const outDir = resolve(cliRoot, 'dist');
+const tsc = resolve(repoRoot, 'node_modules/typescript/bin/tsc');
+
+rmSync(outDir, { recursive: true, force: true });
+execFileSync(process.execPath, [tsc, '-p', resolve(cliRoot, 'tsconfig.build.json')], {
+  cwd: repoRoot,
+  stdio: 'inherit',
+});
+
+const schemaTarget = resolve(outDir, 'core/src/schema.sql');
+mkdirSync(dirname(schemaTarget), { recursive: true });
+copyFileSync(resolve(repoRoot, 'packages/core/src/schema.sql'), schemaTarget);