Fix engine registry tests after copilot-sdk removal

[Copilot]

Tests were failing because they expected 5 built-in engines, but the copilot-sdk engine was removed in the previous PR, leaving only 4 (claude, codex, copilot, custom).

Changes

• Updated TestEngineRegistry to expect 4 engines instead of 5
• Updated TestEngineRegistryCustomEngine to expect 5 engines after registration instead of 6

-	if len(supportedEngines) != 5 {
-		t.Errorf("Expected 5 supported engines, got %d", len(supportedEngines))
+	if len(supportedEngines) != 4 {
+		t.Errorf("Expected 4 supported engines, got %d", len(supportedEngines))

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Original prompt

Reference: https://github.com/github/gh-aw/actions/runs/22128264202/job/63962835060#step:9:1

Fix tests

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[Copilot]

Pull request overview

Updates workflow engine registry tests to reflect removal of the copilot-sdk engine, reducing the number of built-in engines from 5 to 4.

Changes:

• Adjust TestEngineRegistry to expect 4 built-in engines.
• Adjust TestEngineRegistryCustomEngine to expect 5 engines after registering one additional custom engine.

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