Clean Serena import references (#35361)

Author: Copilot

.github/aw/serena-tool.md

@@ -22,7 +22,7 @@ Serena is a **language service protocol (LSP) MCP server** for semantic code ana
 
 ## Configuration
 
-Import the shared Serena workflow via the `imports:` field — `tools.serena` has been removed. For multi-language, first entry is the default fallback:
+Configure Serena through the shared workflow import. For multi-language, the first entry is the default fallback:
 
 ```yaml
 imports:

docs/src/content/docs/reference/serena.md

@@ -73,24 +73,6 @@ Analyze Go code for quality improvements:
 2. Identify code patterns and suggest improvements
 ```
 
-## Migration from `tools.serena`
-
-Replace `tools.serena` with the equivalent import:
-
-```yaml title="Before (removed)"
-tools:
-  serena: ["go", "typescript"]
-```
-
-```aw wrap title="After (recommended)"
-imports:
-  - uses: shared/mcp/serena.md
-    with:
-      languages: ["go", "typescript"]
-```
-
-The shared workflow configures the full Serena MCP server (container image, entrypoint, workspace mount) explicitly.
-
 ## Language Support
 
 Serena supports **30+ programming languages** through Language Server Protocol (LSP):