fix(settings): set editorMode to normal for Claude sessions (#929)

This ensures Claude Code starts in normal editor mode rather than
potentially using vim mode, which can cause issues with automated
text input via tmux send-keys.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

internal/claude/config/settings-autonomous.json

@@ -1,4 +1,5 @@
 {
+  "editorMode": "normal",
   "enabledPlugins": {
     "beads@beads-marketplace": false
   },

internal/claude/config/settings-interactive.json

@@ -1,4 +1,5 @@
 {
+  "editorMode": "normal",
   "enabledPlugins": {
     "beads@beads-marketplace": false
   },