fix(runtime): keep shared artifacts optional

src/k1link/artifact_cli.py

@@ -1,4 +1,4 @@
-"""Operator commands for the Mission Core central artifact gateway."""
+"""Operator commands for the optional Mission Core artifact gateway."""
 
 from __future__ import annotations
 

src/k1link/artifact_gateway.py

@@ -1,4 +1,4 @@
-"""Content-addressed central artifacts with a bounded, offline-capable host cache."""
+"""Optional content-addressed artifact exchange with a bounded local cache."""
 
 from __future__ import annotations
 

src/k1link/web/runtime_readiness.py

@@ -100,8 +100,9 @@ def build_runtime_readiness(
             "central_available": None,
         }
         shared_artifacts_ready = False
-        shared_artifact_degraded = False
+        shared_artifacts_configured = False
     else:
+        shared_artifacts_configured = True
         try:
             artifact = artifact_gateway.status()
             cache = artifact.cache
@@ -127,7 +128,6 @@ def build_runtime_readiness(
                 },
             }
             shared_artifacts_ready = artifact.central_status == "ready"
-            shared_artifact_degraded = not shared_artifacts_ready
         except (OSError, RuntimeError):
             artifact_document = {
                 "mode": "shared",
@@ -135,7 +135,6 @@ def build_runtime_readiness(
                 "central_available": False,
             }
             shared_artifacts_ready = False
-            shared_artifact_degraded = True
 
     media_tools_ready = ffmpeg_available and ffprobe_available
     reconciler_document = reconciler.snapshot()
@@ -151,11 +150,7 @@ def build_runtime_readiness(
         and media_tools_ready
         and reconciler_failures < 3
     )
-    degraded = (
-        shared_artifact_degraded
-        or reconciler_failures > 0
-        or not operational_ready
-    )
+    degraded = reconciler_failures > 0 or not operational_ready
     status = (
         "unavailable"
         if not operational_ready
@@ -170,9 +165,11 @@ def build_runtime_readiness(
         "version": version,
         "readiness": {
             "operational": operational_ready,
-            "production_shared_artifacts": (
-                operational_ready and shared_artifacts_ready
-            ),
+            "optional_shared_artifacts": {
+                "required": False,
+                "configured": shared_artifacts_configured,
+                "ready": shared_artifacts_ready,
+            },
         },
         "plugin_runtimes": {
             "ready": ready_runtime_count,