cmd/sketch: remove colima check

Orbstack works too.
diff --git a/README.md b/README.md
index 69026e0..6efa99c 100644
--- a/README.md
+++ b/README.md
@@ -15,10 +15,11 @@
 ## Requirements
 
 Currently sketch runs on macOS and linux.
-It uses docker/colima for containers.
+It uses docker for containers.
 
-macOS: `brew install colima`
+macOS: `brew install colima` (or an equivalent, like Docker Desktop or Orbstack)
 linux: `apt install docker.io` (or equivalent for your distro)
+WSL2:  install Docker Desktop for Windows (docker entirely inside WSL2 is tricky)
 
 The [sketch.dev](https://sketch.dev) service is used to provide access
 to an LLM service and give you a way to access the web UI from anywhere.
diff --git a/cmd/sketch/reqchecks.go b/cmd/sketch/reqchecks.go
index 2b68adc..b668c7e 100644
--- a/cmd/sketch/reqchecks.go
+++ b/cmd/sketch/reqchecks.go
@@ -30,19 +30,6 @@
 	return fmt.Sprintf("%s %s", path, strings.TrimSpace(string(output))), nil
 }
 
-func checkColima() (string, error) {
-	path, err := exec.LookPath("colima")
-	if err != nil {
-		return "", fmt.Errorf("cannot find `colima` binary; run: brew install docker colima && colima start")
-	}
-	cmd := exec.Command(path, "version")
-	output, err := cmd.CombinedOutput()
-	if err != nil {
-		return "", fmt.Errorf("colima version check failed: %w\n%s\n", err, string(output))
-	}
-	return fmt.Sprintf("%s %s", path, strings.TrimSpace(string(output))), nil
-}
-
 func checkNPM() (string, error) {
 	path, err := exec.LookPath("npm")
 	if err != nil {
@@ -69,11 +56,6 @@
 		cfs = append(cfs, checkDocker)
 	}
 
-	// Only check for Colima on macOS and in safe mode
-	if runtime.GOOS == "darwin" && !isUnsafe {
-		cfs = append(cfs, checkColima)
-	}
-
 	// Always check for NPM
 	cfs = append(cfs, checkNPM)