Update dependencies and enhance VFS staleness testing

- Updated several dependencies in Cargo.lock, including `clap`, `env_logger`, and `rand`, to their latest versions for improved functionality and security.
- Introduced a new API endpoint `/api/validate-tree` for checking tree freshness without applying corrections, enhancing the validation process.
- Added a `TreeFreshnessReport` struct to encapsulate the results of the tree freshness check, providing detailed insights into discrepancies.
- Completed multiple todos in the VFS staleness test plan, ensuring comprehensive coverage for various scenarios and improving the robustness of the testing framework.

These changes enhance the project's dependency management and testing capabilities, ensuring better alignment with the latest implementation standards.

.cursor/plans/vfs_staleness_test_fixtures_dcde048f.plan.md

@@ -4,28 +4,28 @@ overview: Create test fixtures that replicate VFS tree staleness, add a tree-fre
 todos:
   - id: api-endpoint
     content: Add GET /api/validate-tree endpoint that re-snapshots and returns drift counts without correcting the tree
-    status: pending
+    status: completed
   - id: session-method
     content: Extract check_tree_freshness() in ServeSession (no age gate, no apply, returns counts) and set VALIDATE_TREE_ON_CONNECT = false
-    status: pending
+    status: completed
   - id: test-helper
     content: Add assert_tree_fresh() helper and ValidateTreeResponse type to tests/rojo_test/serve_util.rs
-    status: pending
+    status: completed
   - id: fixture
     content: Create rojo-test/serve-tests/stale_tree/ fixture with project file and multiple scripts
-    status: pending
+    status: completed
   - id: staleness-tests
     content: "Write 4 new staleness tests: bulk changes, post-API external edit, rapid delete/recreate, directory restructure"
-    status: pending
+    status: completed
   - id: append-freshness
     content: Append assert_tree_fresh() to all watcher_* and echo_suppression_* tests in two_way_sync.rs
-    status: pending
+    status: completed
   - id: tighten-echo
     content: Tighten echo suppression cursor_delta assertion from < 10 to <= 3
-    status: pending
+    status: completed
   - id: chaos-fuzzer
     content: Write chaos fuzzer test that slams the filesystem with random operations for 10 seconds, then asserts tree freshness
-    status: pending
+    status: completed
 isProject: false
 ---