chore: bump to v4.9.0; record the release in the roadmapv4.9.0

MARKETING_VERSION 4.8.3 -> 4.9.0 and CURRENT_PROJECT_VERSION 43 -> 44
across all targets, with AppVersion.current aligned — the three-way
consistency v4.4.1 established.

The roadmap gains the v4.9.0 entry: the full accessibility pass (#21
phases 0-5 — semantic colours, light mode and the appearance setting,
Dynamic Type reflow and tap targets, VoiceOver, colour independence and
motion/transparency), the audit harness with seeded fixtures and the
engaged enforcement ratchet, the manual verification checklist, and
Swift 6 language mode adoption (#27). Deferred device passes are named
rather than implied.

The v5.0.0 "establish a test target" bullet is rewritten to match
reality: a UI test target now exists with an enforcement gate; what
remains for v5.0.0 is unit coverage of the deterministic core.

1 files changed, 1 insertions, 1 deletions

diff --git a/DomainDig/AppVersion.swift b/DomainDig/AppVersion.swift
index a0956df..4944a3f 100644
--- a/DomainDig/AppVersion.swift
+++ b/DomainDig/AppVersion.swift
@@ -2,6 +2,6 @@ import Foundation
 
 enum AppVersion {
     nonisolated static var current: String {
-        "4.8.3"
+        "4.9.0"
     }
 }