chore: release v1.15.4

Co-Authored-By: claude-flow <ruv@ruv.net>

Author: fuddlesworth

CHANGELOG.md

@@ -7,6 +7,12 @@ Versioning follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [1.15.4] - 2026-02-26
+
+### Fixed
+- **Overlapping zone multi-zone cascade**: Placing cursor on a zone fully inside a larger zone no longer highlights all zones. Fixed detectMultiZone to separate overlapping zones (cursor inside) from edge-adjacent zones (cursor near edge); only edge-adjacent zones trigger multi-zone snap. Replaced bounding-rect expansion with edge-adjacency flood-fill that skips zones spatially overlapping the seed. Removed duplicated smallest-area loop in paint-to-span.
+- **Edge tolerance now respects settings**: Zone-to-zone edge detection uses the user's adjacentThreshold setting instead of a hardcoded 5px value, so manually-gapped layouts work correctly with the configured proximity.
+
 ## [1.15.3] - 2026-02-26
 
 ### Fixed

CMakeLists.txt

@@ -5,7 +5,7 @@
 
 cmake_minimum_required(VERSION 3.16)
 
-project(PlasmaZones VERSION 1.15.3 LANGUAGES CXX)
+project(PlasmaZones VERSION 1.15.4 LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)