Add support for SPECKIT_WORKFLOW_RUN_ID override

[Copilot]

Implements support for overriding workflow run IDs via the SPECKIT_WORKFLOW_RUN_ID environment variable.

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This section details on the original issue you should resolve

<issue_title>Support SPECKIT_WORKFLOW_RUN_ID override</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

What changed

• Added SPECKIT_WORKFLOW_RUN_ID handling in workflow execution so it is used when no explicit run_id argument is provided.
• Preserved precedence so an explicitly passed run_id still overrides the environment variable.
• Added focused tests covering:
  • env-based run ID override behavior
  • explicit run_id precedence over env override

Validation

• ruff check src passed
• Targeted workflow tests for run ID behavior passed
• Parallel validation completed (Code Review + CodeQL), with no security findings

[mnriem]

@copilot Please complete the work

[Copilot]

@copilot Please complete the work

Completed in 6c5cdc8. This adds SPECKIT_WORKFLOW_RUN_ID as a run-id override when no explicit run_id is passed, plus focused tests for env override behavior and explicit run_id precedence.

[mnriem]

@copilot So the workflow CAN be passed in, but if not passed in one is still generated? Correct? And the run id is available in the context of a step, correct?

[Copilot]

Pull request overview

Adds an environment-variable override for workflow run IDs so operators/CI can force a stable run_id without changing call sites, while preserving explicit run_id argument precedence.

Changes:

• Read SPECKIT_WORKFLOW_RUN_ID inside WorkflowEngine.execute() when run_id is not provided.
• Preserve precedence: an explicitly passed run_id continues to win over the environment override.
• Add tests for env override behavior and explicit-arg precedence.

Show a summary per file

File	Description
src/specify_cli/workflows/engine.py	Applies SPECKIT_WORKFLOW_RUN_ID as the effective run id when run_id is None.
tests/test_workflows.py	Adds regression tests asserting env override behavior and precedence rules.

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 2

[Copilot]

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0 new