fix: update tests and golden files for GITHUB_HOST in GitHub MCP server config

[Copilot]

CI broke after GITHUB_HOST: "${GITHUB_SERVER_URL}" was added to the GitHub MCP server env in mcp_renderer_github.go without updating the corresponding tests and golden files.

Changes

• codex_engine_test.go: Updated TestCodexEngineRenderMCPConfig/github_tool_with_user_agent to expect GITHUB_HOST in:

  • TOML env/env_vars fields: env = { "GITHUB_HOST" = "$GITHUB_SERVER_URL", ... }
  • JSON MCP gateway config block: "GITHUB_HOST": "$GITHUB_SERVER_URL", before GITHUB_LOCKDOWN_MODE

• Golden files (basic-copilot, smoke-copilot, with-imports): Regenerated via go test ./pkg/workflow -run='^TestWasmGolden_' -update to reflect GITHUB_HOST in compiled output.

[Copilot]

Pull request overview

Updates test expectations and regenerated WASM golden outputs to match the recently introduced GITHUB_HOST env var in the GitHub MCP server configuration, fixing CI failures caused by stale fixtures.

Changes:

• Updated TestCodexEngineRenderMCPConfig/github_tool_with_user_agent to assert GITHUB_HOST is present in both TOML (env/env_vars) and the JSON MCP gateway config.
• Regenerated WASM compile golden files to include GITHUB_HOST in the GitHub MCP server env block.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
pkg/workflow/codex_engine_test.go	Adjusts test expectations for rendered MCP config to include GITHUB_HOST.
pkg/workflow/testdata/wasm_golden/TestWasmGolden_CompileFixtures/basic-copilot.golden	Regenerated compiled fixture output to include GITHUB_HOST.
pkg/workflow/testdata/wasm_golden/TestWasmGolden_CompileFixtures/smoke-copilot.golden	Regenerated compiled fixture output to include GITHUB_HOST.
pkg/workflow/testdata/wasm_golden/TestWasmGolden_CompileFixtures/with-imports.golden	Regenerated compiled fixture output to include GITHUB_HOST.

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