feat: add mutation tools and help command for v0.0.4

- Add envsitter_add, envsitter_set, envsitter_unset, envsitter_delete tools
- Add envsitter_help tool with comprehensive usage guide for agents
- Change blocking to silent mode (error messages only, no toasts)
- Bump envsitter dependency to ^0.0.4
- Update README with new tools and envsitter library reference
- Update CHANGELOG for v0.0.4

package-lock.json

@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@opencode-ai/plugin": "^1.1.14",
-        "envsitter": "^0.0.3"
+        "envsitter": "^0.0.4"
       },
       "devDependencies": {
         "@types/node": "*",
@@ -45,9 +45,9 @@
       }
     },
     "node_modules/envsitter": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/envsitter/-/envsitter-0.0.3.tgz",
-      "integrity": "sha512-l7YuX/ptwODY0ooU5JuPLN5zrNpjoWU5O01Wi66t24FRYLrXK33ReEr3/TP4Fhaa+S4sQ7uBMLIe8VGmgvIs9g==",
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/envsitter/-/envsitter-0.0.4.tgz",
+      "integrity": "sha512-Uxy5XpYQ9B6+70cQrIOKQMxaitKjMDxaK1uPaivhtVbYxQMRhJzdvx+6AgSrRrZBcnuPlLbnVPXrn7PXpi+veg==",
       "license": "MIT",
       "bin": {
         "envsitter": "dist/cli.js"