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-core/package.json

@@ -41,5 +41,21 @@
       "types": "./dist/world.d.ts",
       "default": "./dist/world.js"
     }
-  }
+  },
+  "bugs": {
+    "url": "https://gitea.com/anomalyco/imhotep/issues"
+  },
+  "homepage": "https://docs.imhotep.dev",
+  "keywords": [
+    "testing",
+    "visual-testing",
+    "layout-testing",
+    "relational-testing",
+    "playwright",
+    "geometry",
+    "fol",
+    "first-order-logic",
+    "e2e",
+    "property-testing"
+  ]
 }