Emit engine metadata on setup spans by injecting GH_AW_INFO_ENGINE_ID into Setup Scripts env

[Copilot]

gh-aw.<job>.setup spans were missing gh-aw.engine.id / gen_ai.system because setup runs before generate_aw_info, so /tmp/gh-aw/aw_info.json is not yet available at setup span emission time. This prevented direct setup-latency slicing by engine from a single span.

• Compiler change: make engine ID available at setup time

  • Updated setup-step generation to emit GH_AW_INFO_ENGINE_ID in Setup Scripts env.
  • Applied in both setup paths:
    • script mode (run: bash .../setup.sh)
    • action mode (uses: .../actions/setup)
  • Engine resolution mirrors existing precedence:
    • engine-config.id first
    • fallback to ai

• Targeted coverage for setup-step env generation

  • Added focused tests asserting GH_AW_INFO_ENGINE_ID is present in generated setup steps:
    • from EngineConfig.ID
    • from AI in script mode

• Golden updates

  • Updated wasm compile golden fixtures impacted by the new setup env line.

- name: Setup Scripts
  env:
    GH_AW_SETUP_WORKFLOW_NAME: "..."
    GH_AW_CURRENT_WORKFLOW_REF: ${{ ... }}
    GH_AW_INFO_ENGINE_ID: "copilot"

This ensures sendJobSetupSpan can resolve engine ID during setup and emit both gh-aw.engine.id and gen_ai.system on the setup span.

[Copilot]

Pull request overview

This pull request ensures gh-aw.<job>.setup spans can emit gh-aw.engine.id / gen_ai.system by making the engine ID available during the setup step (before aw_info.json is generated).

Changes:

• Inject GH_AW_INFO_ENGINE_ID into the Setup Scripts step env in both action and script setup paths, using precedence EngineConfig.ID → AI.
• Add unit tests covering engine ID env injection for action mode (from EngineConfig.ID) and script mode (from AI).
• Update wasm compile golden fixtures to include the new setup-step env line.

Show a summary per file

File	Description
pkg/workflow/compiler_yaml_step_generation.go	Adds engine ID resolution and injects GH_AW_INFO_ENGINE_ID into setup-step env for script + action modes.
pkg/workflow/setup_step_version_test.go	Adds focused tests asserting GH_AW_INFO_ENGINE_ID is present in generated setup steps.
pkg/workflow/testdata/TestWasmGolden_CompileFixtures/with-imports.golden	Golden update to include GH_AW_INFO_ENGINE_ID on setup steps.
pkg/workflow/testdata/TestWasmGolden_CompileFixtures/smoke-copilot.golden	Golden update to include GH_AW_INFO_ENGINE_ID on setup steps.
pkg/workflow/testdata/TestWasmGolden_CompileFixtures/playwright-cli-mode.golden	Golden update to include GH_AW_INFO_ENGINE_ID on setup steps.
pkg/workflow/testdata/TestWasmGolden_CompileFixtures/basic-copilot.golden	Golden update to include GH_AW_INFO_ENGINE_ID on setup steps.

Copilot's findings

Tip

Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

• Files reviewed: 6/6 changed files
• Comments generated: 0

[pelikhan]

@copilot merge main and recompile