refactor: move INTEGRATION_JSON to top-level constants module

Move INTEGRATION_JSON from specify_cli.workflows.constants to
specify_cli.constants to avoid importing the workflows package
when the main CLI module loads.

Update imports in __init__.py and workflows/engine.py accordingly,
and remove the now-empty workflows/constants.py.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Markus

src/specify_cli/__init__.py

@@ -57,9 +57,7 @@
 # For cross-platform keyboard input
 import readchar
 
-# Keep this local so importing specify_cli does not import the workflows package
-# (whose package initialization registers steps and imports all workflow modules).
-INTEGRATION_JSON = ".specify/integration.json"
+from .constants import INTEGRATION_JSON
 
 GITHUB_API_LATEST = "https://api.github.com/repos/github/spec-kit/releases/latest"
 

src/specify_cli/constants.py

@@ -0,0 +1,7 @@
+"""Top-level constants shared by the CLI and the workflow engine.
+
+This module is dependency-free (no typer, no rich, no workflow imports), so it
+can be imported from anywhere inside the package without triggering side effects.
+"""
+
+INTEGRATION_JSON = ".specify/integration.json"

src/specify_cli/workflows/constants.py

@@ -20,7 +20,7 @@
 import yaml
 
 from .base import RunStatus, StepContext, StepResult, StepStatus
-from .constants import INTEGRATION_JSON
+from specify_cli.constants import INTEGRATION_JSON
 
 
 # -- Workflow Definition --------------------------------------------------