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, 157 deletions

diff --git a/internal/tmuxedit/agent_test.go b/internal/tmuxedit/agent_test.go
deleted file mode 100644
index ff782d4..0000000
--- a/internal/tmuxedit/agent_test.go
+++ /dev/null
@@ -1,157 +0,0 @@
-package tmuxedit
-
-import (
-	"fmt"
-	"strings"
-	"testing"
-)
-
-func TestDetectAgent(t *testing.T) {
-	agents := builtinAgents()
-	tests := []struct {
-		name    string
-		content string
-		want    string
-	}{
-		{"cursor box ui", "│ → type here │\n/ commands · @ files", "cursor"},
-		// Cursor panes often show Claude model names; cursor's box UI must be detected first
-		{"cursor not false claude", "Claude 4.5 Sonnet\n│ → test │\n/ commands · @ files", "cursor"},
-		{"amp from banner", "Amp by Sourcegraph\n> ", "amp"},
-		{"aider from banner", "aider v0.50\n> /help", "aider"},
-		{"no match", "some random terminal output\n$ ", "generic"},
-		{"empty content", "", "generic"},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got := detectAgent(tt.content, agents)
-			if got.Name() != tt.want {
-				t.Errorf("detectAgent() = %q, want %q", got.Name(), tt.want)
-			}
-		})
-	}
-}
-
-func TestFindAgentByName(t *testing.T) {
-	agents := builtinAgents()
-	tests := []struct {
-		name string
-		want string
-	}{
-		{"CURSOR", "cursor"},
-		{"amp", "amp"},
-		{"nonexistent", "generic"},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got := findAgentByName(tt.name, agents)
-			if got.Name() != tt.want {
-				t.Errorf("findAgentByName(%q) = %q, want %q", tt.name, got.Name(), tt.want)
-			}
-		})
-	}
-}
-
-func TestDetectAgent_InvalidRegex(t *testing.T) {
-	agents := []Agent{
-		&configAgent{baseAgent{name: "bad", detectPattern: "[invalid"}},
-	}
-	got := detectAgent("anything", agents)
-	if got.Name() != "generic" {
-		t.Errorf("expected generic fallback for invalid regex, got %q", got.Name())
-	}
-}
-
-func TestGenericAgent(t *testing.T) {
-	g := genericAgent()
-	if g.Name() != "generic" {
-		t.Errorf("Name = %q, want generic", g.Name())
-	}
-}
-
-func TestBaseAgent_SendText_Empty(t *testing.T) {
-	b := &baseAgent{newlineKeys: "S-Enter"}
-	err := b.SendText("%1", "")
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-}
-
-func TestBaseAgent_ClearInput_Disabled(t *testing.T) {
-	b := &baseAgent{clearFirst: false, clearKeys: "C-u"}
-	err := b.ClearInput("%1")
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-}
-
-func TestBaseAgent_ClearInput_EmptyKeys(t *testing.T) {
-	// clearFirst=true but no clearKeys should be a no-op
-	b := &baseAgent{clearFirst: true, clearKeys: ""}
-	err := b.ClearInput("%1")
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-}
-
-func TestBaseAgent_ClearInput_Enabled(t *testing.T) {
-	var calls []string
-	deps := noSleepDeps()
-	deps.sendKeys = func(paneID string, keys ...string) error {
-		calls = append(calls, fmt.Sprintf("send:%s:%s", paneID, strings.Join(keys, ",")))
-		return nil
-	}
-
-	b := &baseAgent{clearFirst: true, clearKeys: "C-u", deps: deps}
-	err := b.ClearInput("%2")
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-	if len(calls) != 1 || calls[0] != "send:%2:C-u" {
-		t.Errorf("expected single C-u send call, got %v", calls)
-	}
-}
-
-func TestBaseAgent_ClearInput_Error(t *testing.T) {
-	deps := noSleepDeps()
-	deps.sendKeys = func(string, ...string) error {
-		return fmt.Errorf("send failed")
-	}
-
-	b := &baseAgent{clearFirst: true, clearKeys: "C-u", deps: deps}
-	err := b.ClearInput("%1")
-	if err == nil {
-		t.Fatal("expected error from sendClearSequence failure")
-	}
-}
-
-func TestBaseAgent_ExtractPrompt_NoPattern(t *testing.T) {
-	b := &baseAgent{}
-	got := b.ExtractPrompt("some content")
-	if got != "" {
-		t.Errorf("expected empty, got %q", got)
-	}
-}
-
-func TestBaseAgent_ExtractPrompt_InvalidRegex(t *testing.T) {
-	b := &baseAgent{promptPat: "[invalid"}
-	got := b.ExtractPrompt("> test")
-	if got != "" {
-		t.Errorf("expected empty for invalid regex, got %q", got)
-	}
-}
-
-func TestConfigurable_Interface(t *testing.T) {
-	// Verify that all agent types implement Configurable
-	agents := builtinAgents()
-	for _, a := range agents {
-		c, ok := a.(Configurable)
-		if !ok {
-			t.Errorf("agent %q does not implement Configurable", a.Name())
-			continue
-		}
-		base := c.Base()
-		if base.name != a.Name() {
-			t.Errorf("Base().name = %q, want %q", base.name, a.Name())
-		}
-	}
-}