Remove hexai-tmux-edit popup editor featurev0.42.0

The tmux popup editor and its per-agent detection (Cursor/Amp/Aider)
added maintenance surface without enough use to justify it; Codex and
Claude Code already support external-editor mode natively via Ctrl+G.
Drops internal/tmuxedit, cmd/hexai-tmux-edit, the [tmux_edit] config
schema, the Mage build target, and all related docs/README mentions.

Bump version to 0.42.0.

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

1 files changed, 0 insertions, 32 deletions

diff --git a/internal/appconfig/config_load.go b/internal/appconfig/config_load.go
index ccbf49f..052050b 100644
--- a/internal/appconfig/config_load.go
+++ b/internal/appconfig/config_load.go
@@ -296,7 +296,6 @@ func applyPromptSections(fc *fileConfig, out *App) {
 func applyFeatureSections(fc *fileConfig, out *App) {
 	applyTmuxSection(fc, out)
 	applyStatsSection(fc, out)
-	fc.applyTmuxEdit(out)
 	applyMCPSection(fc, out)
 	applyTmuxActionSection(fc, out)
 }
@@ -564,37 +563,6 @@ func setIfNotBlank(dst *string, value string) {
 	}
 }
 
-// applyTmuxEdit converts the [tmux_edit] section into App fields.
-func (fc *fileConfig) applyTmuxEdit(out *App) {
-	te := fc.TmuxEdit
-	if strings.TrimSpace(te.PopupWidth) != "" {
-		out.TmuxEditPopupWidth = strings.TrimSpace(te.PopupWidth)
-	}
-	if strings.TrimSpace(te.PopupHeight) != "" {
-		out.TmuxEditPopupHeight = strings.TrimSpace(te.PopupHeight)
-	}
-	if strings.TrimSpace(te.DefaultAgent) != "" {
-		out.TmuxEditDefaultAgent = strings.TrimSpace(te.DefaultAgent)
-	}
-	for _, a := range te.Agents {
-		if strings.TrimSpace(a.Name) == "" {
-			continue
-		}
-		out.TmuxEditAgents = append(out.TmuxEditAgents, TmuxEditAgentCfg{
-			Name:           strings.TrimSpace(a.Name),
-			DisplayName:    strings.TrimSpace(a.DisplayName),
-			DetectPattern:  strings.TrimSpace(a.DetectPattern),
-			SectionPattern: strings.TrimSpace(a.SectionPattern),
-			PromptPattern:  strings.TrimSpace(a.PromptPattern),
-			StripPatterns:  a.StripPatterns,
-			ClearFirst:     a.ClearFirst,
-			ClearKeys:      strings.TrimSpace(a.ClearKeys),
-			NewlineKeys:    strings.TrimSpace(a.NewlineKeys),
-			SubmitKeys:     strings.TrimSpace(a.SubmitKeys),
-		})
-	}
-}
-
 func parseSurfaceModels(raw map[string]any, logger *log.Logger) *App {
 	modelsRaw, ok := raw["models"]
 	if !ok {