Add migration dry-run script and standardize space slugs

dry-run.ts validates all 11 adapters against live DB (19 docs, 292 rows,
0 errors). Standardized rwork slug rspace-dev→demo and rvote slug
community→demo so all seeded data uses consistent space identifier.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/local-first/migration/dry-run.ts

@@ -0,0 +1,106 @@
+/**
+ * Dry-run all migration adapters against the live DB.
+ * Usage: bun run server/local-first/migration/dry-run.ts
+ */
+
+import postgres from 'postgres';
+import {
+  migrateModule,
+  notesMigration,
+  workMigration,
+  calMigration,
+  voteMigration,
+  booksMigration,
+  cartMigration,
+  providersMigration,
+  filesMigration,
+  tripsMigration,
+  inboxMigration,
+  splatMigration,
+  type MigrationResult,
+} from './pg-to-automerge';
+
+const DATABASE_URL =
+  process.env.DATABASE_URL || 'postgres://rspace:rspace@rspace-db:5432/rspace';
+
+const sql = postgres(DATABASE_URL, { max: 5, idle_timeout: 10 });
+
+// Wrap postgres.js in a pg-compatible pool.query() interface
+const pool = {
+  async query(text: string, params?: any[]) {
+    const result = params
+      ? await sql.unsafe(text, params)
+      : await sql.unsafe(text);
+    return { rows: Array.from(result) };
+  },
+};
+
+const space = process.argv[2] || 'demo';
+
+const allMigrations = [
+  notesMigration,
+  workMigration,
+  calMigration,
+  voteMigration,
+  booksMigration,
+  cartMigration,
+  providersMigration,
+  filesMigration,
+  tripsMigration,
+  inboxMigration,
+  splatMigration,
+];
+
+async function main() {
+  console.log(`\n=== DRY-RUN MIGRATION (space: "${space}") ===\n`);
+
+  const results: MigrationResult[] = [];
+
+  for (const migration of allMigrations) {
+    const result = await migrateModule(migration, pool, space, undefined, {
+      dryRun: true,
+    });
+    results.push(result);
+    console.log('');
+  }
+
+  console.log('\n=== SUMMARY ===\n');
+  console.log(
+    `${'Module'.padEnd(12)} ${'Docs'.padStart(5)} ${'Rows'.padStart(6)} ${'Errors'.padStart(7)} ${'Time'.padStart(8)}`
+  );
+  console.log('-'.repeat(40));
+
+  let totalDocs = 0;
+  let totalRows = 0;
+  let totalErrors = 0;
+
+  for (const r of results) {
+    console.log(
+      `${r.module.padEnd(12)} ${String(r.docsCreated).padStart(5)} ${String(r.rowsMigrated).padStart(6)} ${String(r.errors.length).padStart(7)} ${(r.durationMs + 'ms').padStart(8)}`
+    );
+    totalDocs += r.docsCreated;
+    totalRows += r.rowsMigrated;
+    totalErrors += r.errors.length;
+  }
+
+  console.log('-'.repeat(40));
+  console.log(
+    `${'TOTAL'.padEnd(12)} ${String(totalDocs).padStart(5)} ${String(totalRows).padStart(6)} ${String(totalErrors).padStart(7)}`
+  );
+
+  if (totalErrors > 0) {
+    console.log('\n=== ERRORS ===\n');
+    for (const r of results) {
+      for (const e of r.errors) {
+        console.error(`[${r.module}] ${e}`);
+      }
+    }
+  }
+
+  await sql.end();
+}
+
+main().catch((e) => {
+  console.error('Fatal:', e);
+  process.exit(1);
+});