fix(runtime): keep shared artifacts optional

docs/adr/0011-laboratory-plugin-runtime-handshake-and-transport-seam.md

@@ -64,7 +64,10 @@ separate future gate.
 
 `GET /api/v1/device-plugin-runtimes` exposes the small lifecycle snapshots. The
 main health response includes ready/total runtime counts as one component beside
-recording-cache, shared-artifact, media-tool and catalog-reconciler readiness.
+recording-cache, optional shared-artifact capability, media-tool and
+catalog-reconciler readiness. A missing optional shared-artifact provider does
+not degrade the complete local contour.
+
 The plugin values still do not claim device connectivity, sensor health,
 process containment or durable supervision.
 

docs/adr/0022-operator-surface-ownership.md

@@ -78,7 +78,7 @@ Contour health reads only live contracts:
 - current Mission Runtime state for active device and perception metrics.
 
 The base health contract now separates local operational readiness from
-production shared-artifact readiness and reports bounded cache, catalog
+optional shared-artifact capability and reports bounded cache, catalog
 reconciler, media-tool and Map Gateway configuration states. It performs no
 remote fan-out and never invents Worker 006 or device health.
 

docs/adr/0033-central-session-artifacts-and-bounded-host-cache.md

@@ -5,17 +5,18 @@ Status: accepted and implemented
 
 ## Decision
 
-Mission Core stores portable recorded-session products in a provider-neutral,
-content-addressed artifact store. The current central provider is the existing
-Synology SMB mount:
+Mission Core can exchange portable recorded-session products through an
+optional provider-neutral, content-addressed artifact gateway. The canonical
+current operator contour is local and complete without a shared store. An
+external filesystem provider is an auxiliary transport/prefetch capability,
+not an operational-readiness dependency and not a production topology
+decision.
 
-```text
-/Volumes/docker/nodedc-mission-core/artifact-store
-```
-
-This is product runtime data. It is not a deploy artifact, a Map Gateway cache,
-a Device Plane package, or a new Docker service. Authentication remains owned
-by the operating-system SMB mount; Mission Core does not receive a NAS password.
+The historical RAVNOVES00 migration acceptance used an existing SMB-backed
+filesystem as one experimental provider. That provider, its mount and its host
+configuration are outside the current Mission Core runtime contract. Mission
+Core does not own its authentication, does not require it at startup and does
+not receive a NAS password.
 
 Every immutable object is stored under:
 
@@ -55,7 +56,7 @@ MISSIONCORE_ARTIFACT_CACHE_MAX_BYTES
 MISSIONCORE_ARTIFACT_CACHE_FREE_SPACE_RESERVE_BYTES
 ```
 
-The central root is configured with:
+An optional shared root is configured explicitly with:
 
 ```text
 MISSIONCORE_ARTIFACT_STORE_ROOT
@@ -115,16 +116,19 @@ When the central root is unavailable:
 `GET /api/health` exposes the effective shared/standalone mode, central-store
 availability, bounded CAS and RRD-cache occupancy, media-tool availability and
 the background catalog reconciler state without disclosing filesystem paths.
-Operational readiness remains distinct from production shared-artifact
-readiness so an offline, already pinned field host stays observable rather than
-being mistaken for a fully connected host.
+`GET /api/health` reports local operational readiness independently. Optional
+shared artifacts are exposed as a non-required capability with separate
+`configured` and `ready` values. Their absence or temporary unavailability does
+not degrade a healthy local contour. When an operator explicitly configures
+that capability, its fail-closed cache-miss semantics still apply to artifacts
+that were expected from the configured gateway.
 
 ## RAVNOVES00 migration acceptance
 
 The source session is `20260720T065719Z_viewer_live`, displayed as
 `RAVNOVES00`.
 
-The accepted central reference currently points to:
+The reference used by that bounded migration acceptance pointed to:
 
 ```text
 092f758c09965be98fd76d8191474c528ee20540dce5f4761c2a087f6056a6d5