Let devtools reuse compatible TypeScript and Vite installs

.changeset/devtools-dependency-ranges.md

@@ -0,0 +1,7 @@
+---
+"@typeonce/effect-machine-devtools": patch
+---
+
+Install the devtools CLI without pinning a second exact TypeScript or Vite.
+
+`@typeonce/effect-machine-devtools` now depends on `typescript` `>=5.9.0 <7.0.0` and `vite` `^8.1.5` instead of exact versions, so a package manager can reuse compatible versions your project already has. No setup changes are required: the CLI still works when your project uses neither, or uses TypeScript 7.

packages/devtools/README.md

@@ -17,6 +17,8 @@ When pinning a release instead of using `latest`, use the same explicit version
 
 The current release requires Node.js 22.19 or newer and stable Effect `^4.0.0`.
 
+The CLI brings its own TypeScript parser and Vite server, so a project does not need to install either. They are regular dependencies with ranges (`typescript` `>=5.9.0 <7.0.0`, `vite` `^8.1.5`), so a package manager can reuse a compatible version the project already has. The project can use any TypeScript version, including TypeScript 7. Devtools only parses source files with the JavaScript compiler API, which TypeScript 7 does not ship, so it keeps its own 5.9–6.x copy in that case.
+
 ## Run the visualizer
 
 Start it from the project that contains the machines:

packages/devtools/package.json

@@ -38,8 +38,8 @@
     "@typeonce/effect-machine": "workspace:^",
     "chokidar": "4.0.3",
     "elkjs": "0.12.0",
-    "typescript": "6.0.3",
-    "vite": "8.1.5"
+    "typescript": ">=5.9.0 <7.0.0",
+    "vite": "^8.1.5"
   },
   "peerDependencies": {
     "effect": "^4.0.0"