Say 31 MCP tools in the stack table and stage the 0.4.2 notes

Author: cezaraugusto

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## 0.4.2
+
+Accuracy release alongside @extension.dev/mcp 5.1.0.
+
+### Changed
+
+- The MCP companion's tool count is 31 (the deploy tool joined the surface);
+  the stack table said 30.
+- Ships the em dash cleanup across docs, comments, and shipped strings that
+  landed after 0.4.1.
+
 ## 0.4.1
 
 Docs-only release: trims a retired entry from the stack table so the companion

skills/extension-dev/SKILL.md

@@ -17,7 +17,7 @@ publish.
 
 Two companions do the heavy lifting. Prefer them over guessing:
 
-- **`@extension.dev/mcp`** (MCP server): 30 tools for scaffolding, building,
+- **`@extension.dev/mcp`** (MCP server): 31 tools for scaffolding, building,
   live DOM inspection, log streaming, storage access, publishing, and headless
   release promotion. If its `extension_*` tools are available in the session,
   use them.