chore(library): add changesets for the two behavioural repairs

The e2e repairs that a user would notice: edges reappearing, and Delete and
Escape reaching the handler that was meant to answer them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LuVfUjEN3BSUNFK5TyQ37k

Author: FelixTJDietrich

.changeset/edges-find-anchors.md

@@ -0,0 +1,5 @@
+---
+"@tumaet/apollon": patch
+---
+
+Edges anchored to a connection point their node does not draw render again instead of disappearing from the diagram.

.changeset/keys-reach-handlers.md

@@ -0,0 +1,5 @@
+---
+"@tumaet/apollon": patch
+---
+
+Pressing Delete on a selected edge's waypoint removes just that waypoint rather than the whole edge, and Escape clears the selection when it leaves multi-selection mode.