Add public phase timing skill

[msandeep12]

Summary
This change adds phase timing support to the OpenSpec workflow, improving how phase progress and timing are tracked during change execution.

What changed
Added support for phase timing behavior in the relevant workflow logic
Updated related command and state handling to reflect timing information
Adjusted tests and supporting logic to cover the new behavior
Why
This improves visibility into phase progression and helps make the workflow more predictable and easier to reason about during execution.

Testing
Verified relevant unit and integration tests for the updated workflow behavior

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