ADR 0051 (proposed) — shared data is the operator's

Resolves 04-ISSUES/036: eight media modules each declared the shared
library and download directories as their own resources, and the
resolver's duplicate-owner refusal — right in general — would refuse the
stack's only sensible assignment the first time two landed on one node.

The decision, from the operator: shared, pre-existing data is
operator-owned and external. The mesh does not create, chown, reconcile
or remove it. A module declares it needs access to such a path (read or
read-write); the host mounts it and owns nothing. Several modules
accessing one path is normal — the duplicate-path refusal is about
ownership, not use. An accessed path absent at apply is refused clearly,
not created. Extends ADR 0030: the third case the host had no word for,
what it neither made nor configured and must not touch.

Point 036's fixed-by/amended-design at the record; mark it located in
mesh-control, mesh-catalog and mesh-host. Regenerate the decision index.

Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF

02-DECISIONS/README.md

@@ -119,6 +119,7 @@ python3 00-META/checks/index.py            fail if stale
 - **0048** — [A provider creates the credential the mesh minted, and seals nothing](0048-a-provider-creates-the-credential-the-mesh-minted.md)
 - **0049** — [A consumer's identity is bounded by the tightest backend that must accept it](0049-a-consumers-identity-fits-the-tightest-backend.md)
 - **0050** — [Model access is vendor-agnostic, and a vendor is an adapter](0050-model-access-is-vendor-agnostic.md)
+- **0051** — [Shared data is the operator's, and a module is granted access to it](0051-shared-data-is-the-operators.md)  *(proposed)*
 
 ### How it is built