docs: add v0.41.1 changelog section and refresh session handoff

CHANGELOG gains the missing [0.41.1] section (pile-marker child-resize
fix + Android relayout diagnostics). SESSION_HANDOFF is brought forward
from the stale v0.40.0 state to today's: v0.41.x releases, the July 6
review arc (PRs #121-#131), Fold 7 on-device verification results, the
remaining device-checklist items, and new architectural notes (plugin
submodule pattern, marker child-resize rule, Fold 7 inset quirks).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,24 @@ project follows [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+## [0.41.1] — 2026-07-06
+
+### Fixed
+
+- **Oversized pile-marker frames after fold/unfold.** `on_window_resized`
+  resized the marker fill sprite but never its children, so the outline frame
+  and the "A"/"K" watermark kept their spawn-time size after any resize —
+  rendering as oversized grey slabs over empty foundation slots on foldables
+  (found during Galaxy Fold 7 on-device verification of v0.41.0, fixed and
+  re-verified on the same device). Both children are now re-derived from the
+  new layout on every relayout.
+
+### Added
+
+- **Android relayout diagnostics.** Every layout recompute on Android now
+  logs its window dimensions and insets (`layout: resize to WxH …`) — the
+  evidence channel for foldable layout reports (#130).
+
 ## [0.41.0] — 2026-07-06
 
 > Consolidates everything shipped since v0.39.0, including the v0.40.0–v0.40.3