Fix test expectations for MCP gateway config piping format

[Copilot]

Recent MCP gateway changes (PR #9839) modified how MCP configurations are passed to the gateway script - from writing to files to piping directly. Three test cases in engine_helpers_shared_test.go still expected the old format.

Changes

• Updated test expectations for TestRenderJSONMCPConfig:
  • Changed from cat > /tmp/test-config.json << EOF to cat << MCPCONFIG_EOF | bash /opt/gh-aw/actions/start_mcp_gateway.sh
  • Updated EOF delimiter from EOF to MCPCONFIG_EOF
  • Fixed "post-EOF commands" test to expect commands are no longer appended (behavior changed with piping)

// Before
expectedContent: []string{
    "cat > /tmp/test-config.json << EOF",
    "EOF",
}

// After  
expectedContent: []string{
    "cat << MCPCONFIG_EOF | bash /opt/gh-aw/actions/start_mcp_gateway.sh",
    "MCPCONFIG_EOF",
}

Verification

• All TestRenderJSONMCPConfig subtests pass
• Workflow compilation with --validate works correctly
• 121 workflows compile successfully

Note

Other engine-specific tests (Codex, Copilot, Custom) still fail - these were already broken by PR #9839 and expect the old format without the MCP gateway JSON section. Out of scope for this fix.

Original prompt

Recompile, fix the compiler so that the generated MCP config will validate

Custom agent used: agentic-workflows
GitHub Agentic Workflows (gh-aw) - Create, debug, and upgrade AI-powered workflows with intelligent prompt routing

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[github-actions]

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Smoke Test Results

Last 2 Merged PRs:

• Add secrets diagnostics workflow for repository health monitoring #9850: Add secrets diagnostics workflow for repository health monitoring
• Remove unused pkg/campaign/prompts directory #9848: Remove unused pkg/campaign/prompts directory

Test Results:

• ✅ GitHub MCP: Retrieved merged PRs
• ❌ Serena Go: Tool not available (go command not found)
• ✅ Playwright: Navigated to GitHub, title contains "GitHub"
• ✅ File Writing: Created test file successfully
• ✅ Bash Tool: Verified file content

Overall Status: PARTIAL PASS (4/5 tests passed)

cc @pelikhan

AI generated by Smoke Copilot

[github-actions]

Smoke Test Results - Claude Engine

Last 2 merged PRs:

• Add workflow: githubnext/agentics/weekly-research #8: Add workflow: githubnext/agentics/weekly-research
• Remove ai-inference, opencode, genaiscript agentic engines for now #10: Remove ai-inference, opencode, genaiscript agentic engines for now

Test Results:

• ✅ GitHub MCP (list PRs)
• ❌ Serena Go (tool unavailable - no 'go version' capability)
• ✅ Playwright (navigated to github.com, title verified)
• ✅ Tavily Web Search (returned 10 results for "GitHub Agentic Workflows")
• ✅ File Writing (created test file)
• ✅ Bash (verified file content)

Status: FAIL (Serena Go test failed - no basic Go command execution available)

AI generated by Smoke Claude