Implement durable typed journals, subscriptions, and Reader document connections

Add checked native journal/subscription bindings, managed-reference retention,
bounded history and backpressure, atomic delivery receipts, and fenced hosting.
Preserve source publication prediction and replica reconciliation; subscription
attachment, controls, and delivery remain authoritative in this initial version.

Connect independent manual/Gutenberg document producers to Reader bookshelves
through typed adapters. Add connection inspection, shared provider selection,
authoring documentation, and restart/rejection/fan-out integration coverage.

Verified compiler suite (287 passed, two existing skips), Nix runtime and
PostgreSQL qualification, five example assemblies, headless Reader integration,
Chromium Reader integration, resource pins, formatting, and lint.
No pinned workspace runtime was deployed.

src/query/link.ts

@@ -98,6 +98,11 @@ export function linkQueries(workspace: WorkspaceRevision): LinkedQuery[] {
                 `Package query field ${effect.memberId} needs query-reason`,
               );
           } else if (binding.kind === "state" && binding.primitive === "read") needed.add(binding.slotId);
+          else if (
+            (binding.kind === "journal" && binding.primitive === "head") ||
+            (binding.kind === "subscription" && binding.primitive === "status")
+          )
+            needed.add(binding.slotId);
           else if (binding.kind === "edge" && binding.primitive === "resolve") needed.add(binding.edgeTypeId);
           else
             throw new QueryCompileError(