fix(durable-effects): use approved category keywords per package-json-metadata policy

Replace custom keywords (durable, effects, workflow) with approved
categories: concurrency, io, process.

Author: Taras Mankovski

durable-effects/package.json

@@ -35,7 +35,7 @@
     "node": ">= 22"
   },
   "sideEffects": false,
-  "keywords": ["durable", "effects", "concurrency", "workflow"],
+  "keywords": ["concurrency", "io", "process"],
   "files": ["dist", "*.ts", "README.md"],
   "devDependencies": {
     "@effectionx/bdd": "workspace:*",