Add mise check task for workspace: protocol validation

The pnpm workspace: protocol requires a version specifier (*, ^, or ~).
Using "workspace:" without a specifier is invalid but pnpm doesn't
report a clear error, which can cause issues with tools like moonrepo.

This adds a check:manifest:workspace-protocol task that detects invalid
patterns and fails the CI check if found.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: moreal

mise.toml

@@ -46,6 +46,7 @@ depends = [
   "check:types",
   "check:md",
   "check-versions",
+  "check:manifest:workspace-protocol",
 ]
 
 [tasks."check:fmt"]
@@ -75,6 +76,17 @@ else
 fi
 '''
 
+[tasks."check:manifest:workspace-protocol"]
+description = "Check for invalid workspace: specifiers without version (*, ^, ~)"
+run = '''
+if grep -rE '"workspace:"[[:space:]]*[,}]' --include='package.json' .; then
+  echo "Error: Found invalid workspace: specifier without *, ^, or ~"
+  echo "Valid formats: workspace:*, workspace:^, workspace:~"
+  exit 1
+fi
+echo "All workspace: specifiers are valid"
+'''
+
 [tasks.fmt]
 description = "Format the codebase"
 run = "deno fmt && hongdown --write"