Denial is not absence — detection learns the unverifiable answer 06 ruled for it

Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy

KanbanTests/BoardSettingsSheetTests.swift

@@ -37,6 +37,14 @@ struct BoardSettingsSectionTests {
         #expect(offered == Set(BoardSettingsSection.allCases))
     }
 
+    @Test("Pro, unverifiable: the sheet has nothing to show — structurally like repo-nested")
+    func unverifiableHoldsNothing() {
+        // "Denial is not absence" (06 ▸ Rules ▸ Detection, ruled 2026-07-31): a denied ancestor check
+        // can never be told apart from a repository actually being there, so add-git stays as
+        // unreachable here as it is on a genuinely nested board.
+        #expect(BoardSettingsSection.resolve(tier: .pro, mode: .unverifiable) == [])
+    }
+
     @Test("The sections carry the headers VoiceOver navigates by")
     func headersAreNamed() {
         // 10-accessibility.md ▸ Board settings sheet: "titled and sectioned with headers VoiceOver
@@ -65,6 +73,10 @@ struct BoardSettingsAvailabilityTests {
         // popover's explanation stands and no door opens.
         #expect(!BoardSettingsAvailability.resolve(tier: .pro, mode: .repoNested))
 
+        // **Pro, unverifiable**: the same unreachability, for the denial-not-absence reason — a
+        // denied ancestor check is never distinguishable from a repository actually being there.
+        #expect(!BoardSettingsAvailability.resolve(tier: .pro, mode: .unverifiable))
+
         // **The free tier**: no setup exists there at all (12-editions.md ▸ The free tier and
         // `.git`), whatever mode a stray value claims — detection never runs off Pro, so the mode is
         // swept for completeness rather than because it can vary.