fix(lifecycle): warn when waitFor references phase with no commands

[skevetter]

Summary

Re-implementation of #107. Adds a debug-level warning when the waitFor phase has no commands configured, indicating the split point is a no-op. Also adds InitTestObserved to pkg/log for capturing log output in tests, and 4 new tests covering phaseHasCommands behavior and the warning log emission.

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🔨 Latest commit	ff0c8b1
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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: c9aca569-408d-47fc-b2f4-ed0443f5f6c3

📥 Commits

Reviewing files that changed from the base of the PR and between 377bac9 and ff0c8b1.

📒 Files selected for processing (3)

• pkg/devcontainer/setup/lifecyclehooks.go
• pkg/devcontainer/setup/lifecyclehooks_test.go
• pkg/log/testing.go

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