fix(workflow): bump speckit_version floor and harden CLI loader on #2421

- workflows/speckit/workflow.yml: bump ``requires.speckit_version`` from
  ``>=0.7.2`` to ``>=0.8.3`` so older spec-kit versions, which lack the
  engine-side resolution of the ``integration: "auto"`` sentinel, do not
  pull this workflow from the catalog and then fail by treating "auto"
  as a literal integration key. Adds an inline comment explaining the
  reason for the floor.
- src/specify_cli/__init__.py: ``_read_integration_json`` now also
  catches ``UnicodeDecodeError`` (non-UTF8 file) so the CLI fails with
  a targeted, actionable diagnostic instead of an uncaught traceback,
  and notes in the docstring that the function shares its low-level
  parsing surface with ``_paths.try_read_integration_json`` while
  keeping loud per-cause messaging on top.

Author: Quratulain-bilal

src/specify_cli/__init__.py

@@ -1898,7 +1898,13 @@ def get_speckit_version() -> str:
 
 
 def _read_integration_json(project_root: Path) -> dict[str, Any]:
-    """Load ``.specify/integration.json``.  Returns ``{}`` when missing."""
+    """Load ``.specify/integration.json``.  Returns ``{}`` when missing.
+
+    Shares its low-level parsing surface with
+    :func:`specify_cli._paths.try_read_integration_json` (used by the
+    workflow engine) but keeps loud, per-cause diagnostics so CLI users
+    get actionable messages instead of a silent fallback.
+    """
     path = project_root / INTEGRATION_JSON
     if not path.exists():
         return {}
@@ -1909,6 +1915,11 @@ def _read_integration_json(project_root: Path) -> dict[str, Any]:
         console.print(f"Please fix or delete {INTEGRATION_JSON} and retry.")
         console.print(f"[dim]Details:[/dim] {exc}")
         raise typer.Exit(1)
+    except UnicodeDecodeError as exc:
+        console.print(f"[red]Error:[/red] {path} is not valid UTF-8.")
+        console.print(f"Please fix or delete {INTEGRATION_JSON} and retry.")
+        console.print(f"[dim]Details:[/dim] {exc}")
+        raise typer.Exit(1)
     except OSError as exc:
         console.print(f"[red]Error:[/red] Could not read {path}.")
         console.print(f"Please fix file permissions or delete {INTEGRATION_JSON} and retry.")

workflows/speckit/workflow.yml

@@ -7,7 +7,10 @@ workflow:
   description: "Runs specify → plan → tasks → implement with review gates"
 
 requires:
-  speckit_version: ">=0.7.2"
+  # 0.8.3 is the first release with engine-side resolution of the
+  # ``integration: "auto"`` default. Older versions would treat "auto"
+  # as a literal integration key and fail at dispatch.
+  speckit_version: ">=0.8.3"
   integrations:
     # The four commands below (specify, plan, tasks, implement) are core
     # spec-kit commands provided by every integration. The list here is an