feat(workflows): implement issues with Codex agent

.github/workflows/shared/mcp/serena.md

@@ -0,0 +1,35 @@
+---
+# Serena MCP Server - Multi-Language Code Analysis
+# Source: https://github.com/github/gh-aw/blob/main/.github/workflows/shared/mcp/serena.md
+import-schema:
+  languages:
+    type: array
+    items:
+      type: string
+    required: true
+    description: Languages enabled for Serena LSP analysis.
+mcp-servers:
+  serena:
+    container: "ghcr.io/oraios/serena:1.7.0"
+    args:
+      - "--network"
+      - "host"
+    entrypoint: "/workspaces/serena/.venv/bin/serena"
+    entrypointArgs:
+      - "start-mcp-server"
+      - "--context"
+      - "codex"
+      - "--project"
+      - \${GITHUB_WORKSPACE}
+    env:
+      PATH: /tmp/gh-aw/lsp/bin:\${PATH}
+    mounts:
+      - \${GITHUB_WORKSPACE}:\${GITHUB_WORKSPACE}:rw
+      - \${RUNNER_TOOL_CACHE}:\${RUNNER_TOOL_CACHE}:ro
+      - /tmp/gh-aw/lsp:/tmp/gh-aw/lsp:ro
+---
+
+## Serena code analysis
+
+Serena is enabled for **${{ github.aw.import-inputs.languages }}**. Activate `${{ github.workspace }}` first, then use
+semantic symbol, reference, and diagnostic tools before broad text searches or edits.