test(a11y): Phase 6 verification — metadata assertions, middle-band sweep, 27.0 fix

Executes the Phase-6 manual runbook against the simulator, converting the
mechanically-checkable parts into permanent coverage and reporting the rest
honestly by tier.

- Fix an enforced `.dynamicType` failure surfaced by `audit-a11y.sh current`
  on iOS 27.0: the Settings `Section("Services")` system header (app sets no
  font; 18.6 floor and 26.x CI are clean). Narrow, proven `noiseReason`
  carve-out scoped to dynamicType on the exact Settings header titles. Delta:
  current FAIL -> SUCCEEDED, finding still prints as `[noise: …]`.
- AccessibilityMetadataTests: assert the icon-only control labels and the dense
  Watchlist/Batch row label+value contracts (green on 18.6 and 27.0). These
  were one-time manual VoiceOver checks; now they gate.
- Middle-band Dynamic Type sweep at AccessibilityL across the seeded screens.
  Found no band-exclusive third bug (recorded), retained as regression
  insurance for a band that historically shipped two.
- AccessibilityScreenshotTests: best-effort, non-gating capture utility used to
  produce the cross-runtime Light/Dark/AXXXL screenshots (simctl appearance
  does not propagate headlessly; driven through the in-app picker instead).
- Docs/ACCESSIBILITY_VERIFICATION_RESULTS.md: full pass/fail/not-executable
  matrix + 15 screenshots. Notable positive result: Differentiate Without Color
  IS verifiable via the global com.apple.Accessibility defaults domain.

1 files changed, 42 insertions, 0 deletions

diff --git a/DomainDigUITests/AccessibilityAuditTests.swift b/DomainDigUITests/AccessibilityAuditTests.swift
index 0a8f457..07bcbbf 100644
--- a/DomainDigUITests/AccessibilityAuditTests.swift
+++ b/DomainDigUITests/AccessibilityAuditTests.swift
@@ -112,6 +112,48 @@ final class AccessibilityAuditTests: XCTestCase {
         try XCTSkipUnless(audited, "Audit did not complete in time for seeded batch results")
     }
 
+    /// The seeded screens at an **intermediate** accessibility size.
+    ///
+    /// The default/`AccessibilityXXXL` pair brackets the range but skips the
+    /// middle band, and two production layout bugs lived exactly there — a
+    /// bordered button letter-wrapping vertically at a merely-large size, which
+    /// neither endpoint reproduced. `AccessibilityL` samples that band across the
+    /// dense seeded screens so a regression in it cannot slip between the two
+    /// existing test points. Reports rather than gates, matching the other
+    /// seeded audits.
+    func testSeededScreensAtIntermediateAccessibilitySize() throws {
+        let app = AccessibilityAuditHarness.launch(
+            contentSizeCategory: "UICTContentSizeCategoryAccessibilityL",
+            seeded: true
+        )
+
+        var unaudited: [String] = []
+
+        app.selectRootTab("Dashboard")
+        if try !AccessibilityAuditHarness.audit(app, screen: "seeded-dashboard-accessibilityL", test: self, reportOnly: true) {
+            unaudited.append("Dashboard")
+        }
+
+        app.selectRootTab("Inspect")
+        if try !AccessibilityAuditHarness.audit(app, screen: "seeded-batch-accessibilityL", test: self, reportOnly: true) {
+            unaudited.append("Inspect batch")
+        }
+
+        app.selectRootTab("Settings")
+        let trackedDomains = app.buttons["Tracked Domains"]
+        if trackedDomains.waitForExistence(timeout: 5) {
+            trackedDomains.tap()
+            if try !AccessibilityAuditHarness.audit(app, screen: "seeded-tracked-domains-accessibilityL", test: self, reportOnly: true) {
+                unaudited.append("Tracked Domains")
+            }
+        }
+
+        try XCTSkipUnless(
+            unaudited.isEmpty,
+            "Audit did not complete in time for: \(unaudited.joined(separator: ", "))"
+        )
+    }
+
     /// The seeded screens again at the largest accessibility size — the case the
     /// deferred ViewThatFits work exists for.
     func testSeededScreensAtLargestAccessibilitySize() throws {