Fix engine registry test failures after custom engine re-addition

[Copilot]

Tests failed after commit 0aab1fb re-added the custom engine to fix TestValidateEngine, but test expectations still assumed only 3 engines (claude, codex, copilot).

Changes

Test expectations updated (agentic_engine_test.go)

• TestEngineRegistry: 3 → 4 engines
• TestEngineRegistryCustomEngine: 4 → 5 engines (after adding test-custom)
• Added custom engine validation checks

Nil slice initialization fixed (engine_helpers.go)

• InjectCustomEngineSteps now returns empty slice []GitHubActionStep{} instead of nil
• Prevents assert.NotNil failures in interface tests when no custom steps exist

// Before: returns nil when no custom steps
var steps []GitHubActionStep

// After: returns empty slice
steps := []GitHubActionStep{}

Fixes 4 failing tests:

• TestEngineRegistry
• TestEngineRegistryCustomEngine
• TestInterfaceSegregation
• TestSpecificInterfaceUsage

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/graphql
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Original prompt

Fix the failing GitHub Actions workflow test
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 63969082538
Job URL: https://github.com/github/gh-aw/actions/runs/22130374228/job/63969082538

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