fix(review): address review comments and add .pr-review.json for pragent

.pr-review.json

@@ -0,0 +1,21 @@
+{
+  "languages": [
+    "java",
+    "yaml",
+    "markdown"
+  ],
+  "focus": [
+    "thread-safety",
+    "paper-chunk-ticketing",
+    "item-loss-prevention",
+    "resource-cleanup",
+    "performance-and-chunk-loading",
+    "null-safety-and-unit-tests"
+  ],
+  "exclude_paths": [
+    "target/**",
+    "*.bak*",
+    "docs/**"
+  ],
+  "instructions": "Canalhandia is a Minecraft Paper 1.21.x server plugin written in modern Java 25. Enforce these core invariants:\n1. Thread Safety: Bukkit API, World, Entity, and Inventory mutations MUST run on the main server thread. Async threads only do pure calculation or async file I/O.\n2. Item & Inventory Safety: Never discard player items. Always handle full-inventory overflow by dropping excess items at the player's location. On multi-step container placement (e.g. chests), roll back blocks if not all items fit.\n3. Lifecycle & Cleanup: All registered chunk tickets, recipes, schedulers, and I/O executors must be cleanly flushed and unloaded in onDisable() and module toggles.\n4. Chunk Loading: Never trigger synchronous chunk generation or loading inside event handlers. Always check world.isChunkLoaded() before querying blocks.\n5. Test Coverage: All domain logic, coordinates math, parsers, and pure helpers must have corresponding JUnit tests in src/test/java."
+}