chore: polish for FOL contract delivery (CHANGELOG, CLI guardrails, metadata)

- Update CHANGELOG.md for 1.1.0 (date, refactoring, repository fixes)
- Add overwrite guardrails to imhotep-cli init — skips existing files
- Add bugs/homepage/keywords metadata to 5 public packages
- Mark imhotep-bench and imhotep-fixtures as private packages
- Add selector field to SourceReference interface (core types)
- Remove 7  casts from check-all.ts (folAst.position, cardinality results)
- Generate package-lock.json for reproducible installs

packages/imhotep-cli/src/cli.ts

@@ -50,8 +50,15 @@ function main(): void {
       : process.cwd();
     
     try {
-      initProject({ preset, targetDir });
+      const result = initProject({ preset, targetDir });
       console.log(`✓ Scaffolded ${preset} project in ${targetDir}`);
+
+      if (result.created.length > 0) {
+        console.log(`  Created: ${result.created.map(f => f.replace(targetDir, '.')).join(', ')}`);
+      }
+      if (result.skipped.length > 0) {
+        console.warn(`  Skipped (already exists): ${result.skipped.map(f => f.replace(targetDir, '.')).join(', ')}`);
+      }
       console.log(`  Run: cd ${targetDir} && npm install && npm test`);
     } catch (error: any) {
       console.error(`Error: ${error.message}`);