feat(migrate): plans importer

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

migrate/sources/plans.js

@@ -0,0 +1,25 @@
+import { readdirSync, readFileSync } from 'node:fs';
+import { join } from 'node:path';
+import * as pages from '../../lib/db/repos/pages.js';
+import * as map from '../../lib/db/repos/migration_map.js';
+
+const SYS = { kind: 'system', id: null };
+const slugify = (s) => s.toLowerCase().replace(/[^a-z0-9]+/g, '-').replace(/(^-|-$)/g, '').slice(0, 60) || 'page';
+function titleOf(body, file) {
+  const m = body.match(/^#\s+(.+)$/m);
+  return m ? m[1].trim() : file.replace(/\.md$/, '');
+}
+
+export async function importPlans({ dir, spaceId, dryRun = false }) {
+  let created = 0;
+  for (const file of readdirSync(dir).filter(f => f.endsWith('.md')).sort()) {
+    if (await map.seen('plans', file, 'page')) continue;
+    const body = readFileSync(join(dir, file), 'utf8');
+    const title = titleOf(body, file);
+    created++;
+    if (dryRun) continue;
+    const page = await pages.create({ space_id: spaceId, slug: slugify(title), title, body_md: body }, SYS);
+    await map.record('plans', file, 'page', page.id);
+  }
+  return { created };
+}