feat: owner Pro+ allowlist via CloudKit, cut v5.0.1v5.0.1

Grants the app owner Pro+ without a purchase, keyed to their CloudKit
user-record ID so it works on the release App Store build.

- OwnerAccess holds the owner's CloudKit user-record ID (opaque, per-Apple-ID,
  scoped to the app's container; safe to publish — CloudKit verifies identity
  server-side, so it can't be presented by anyone else).
- PurchaseService resolves the allowlist against CloudKit once per launch and,
  on a match, records a persisted owner grant so it applies instantly and
  offline thereafter. The grant only ever elevates the tier to .proPlus and
  defers to the existing #if DEBUG overrides, so real purchases and free/pro
  testing are unaffected. cachedTier / cachedEntitlement were refactored to
  fall back to the owner grant only when no debug override or stored purchase
  applies.
- Supersedes the DEBUG record-ID reveal (PR #60): its only purpose was to read
  the owner's ID, which is now hardcoded, so the reveal is not shipped.

Release cut: MARKETING_VERSION 5.0.0 -> 5.0.1, CURRENT_PROJECT_VERSION 45 -> 46,
AppVersion.current -> 5.0.1, roadmap updated. App builds clean; unit suite 63/63.

1 files changed, 34 insertions, 0 deletions

diff --git a/DomainDig/OwnerAccess.swift b/DomainDig/OwnerAccess.swift
new file mode 100644
index 0000000..eca2bab
--- /dev/null
+++ b/DomainDig/OwnerAccess.swift
@@ -0,0 +1,34 @@
+import CloudKit
+
+/// Owner-only entitlement support. The app owner is identified by their CloudKit
+/// user-record ID — a stable, opaque per-Apple-ID value for this app's container.
+/// `PurchaseService` grants the owner Pro+ when the signed-in iCloud user matches,
+/// so the owner does not need a purchase.
+///
+/// Publishing the record ID here is safe: it is not an Apple ID or any personal
+/// identifier, it is scoped to the `iCloud.net.cleberg.DomainDig` container, and
+/// CloudKit identity is verified server-side — another user cannot present it as
+/// their own. An empty value makes the allowlist inert.
+enum OwnerAccess {
+    static let ownerUserRecordID = "_1c35d6a25540b3ef00023cc0425ec373"
+
+    static var isConfigured: Bool { !ownerUserRecordID.isEmpty }
+
+    /// The current iCloud user's record name for this app's container, or nil if
+    /// it is unavailable (not signed into iCloud, restricted, or offline before
+    /// the first fetch).
+    static func currentUserRecordName() async -> String? {
+        do {
+            return try await CKContainer.default().userRecordID().recordName
+        } catch {
+            return nil
+        }
+    }
+
+    /// True only when the allowlist is configured and the current iCloud user is
+    /// the owner.
+    static func isOwner() async -> Bool {
+        guard isConfigured else { return false }
+        return await currentUserRecordName() == ownerUserRecordID
+    }
+}