refactor: introduce shared/smoke-engine-base.md to consolidate smoke test scaffold

.github/workflows/shared/smoke-engine-base.md

@@ -0,0 +1,14 @@
+---
+# Smoke test engine base
+# Provides the standard scaffold for engine smoke tests:
+# gh CLI tools, token telemetry validation, and report+OTLP observability.
+#
+# Usage:
+#   imports:
+#     - shared/smoke-engine-base.md
+
+imports:
+  - shared/gh.md
+  - shared/token-telemetry-check.md
+  - shared/reporting-otlp.md
+---

.github/workflows/smoke-claude.md

@@ -30,12 +30,10 @@ engine:
   bare: true
 inlined-imports: true
 imports:
-  - shared/gh.md
+  - shared/smoke-engine-base.md
   - shared/mcp/tavily.md
   - shared/go-make.md
   - shared/github-mcp-app.md
-  - shared/otlp.md
-  - shared/token-telemetry-check.md
 network:
   allowed:
     - defaults

.github/workflows/smoke-codex.md

@@ -27,12 +27,9 @@ permissions:
 name: Smoke Codex
 engine: codex
 imports:
-  - shared/gh.md
-  - shared/reporting-otlp.md
+  - shared/smoke-engine-base.md
   - shared/mcp/serena-go.md
   - shared/trufflehog.md
-  - shared/otlp.md
-  - shared/token-telemetry-check.md
 network:
   allowed:
     - defaults