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, 110 deletions

diff --git a/internal/tmuxedit/send_test.go b/internal/tmuxedit/send_test.go
deleted file mode 100644
index 64e1d36..0000000
--- a/internal/tmuxedit/send_test.go
+++ /dev/null
@@ -1,110 +0,0 @@
-package tmuxedit
-
-import (
-	"fmt"
-	"strings"
-	"testing"
-)
-
-func noSleepDeps() tmuxEditDeps {
-	return tmuxEditDeps{sleepAfterClear: func() {}, sleepAfterEscape: func() {}}
-}
-
-func TestDeduplicateText(t *testing.T) {
-	tests := []struct {
-		name     string
-		original string
-		edited   string
-		want     string
-	}{
-		{"empty both", "", "", ""},
-		{"empty original", "", "new text", "new text"},
-		{"empty edited", "original", "", ""},
-		{"unchanged", "hello world", "hello world", ""},
-		{"appended", "hello", "hello world", "hello world"},
-		{"rewritten", "hello world", "goodbye world", "goodbye world"},
-		{"whitespace handling", "  hello  ", "  hello  world  ", "hello  world"},
-		{"appended with newlines", "line1\nline2", "line1\nline2\nline3", "line1\nline2\nline3"},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got := deduplicateText(tt.original, tt.edited)
-			if got != tt.want {
-				t.Errorf("deduplicateText(%q, %q) = %q, want %q",
-					tt.original, tt.edited, got, tt.want)
-			}
-		})
-	}
-}
-
-func TestSendLines_SingleLine(t *testing.T) {
-	var calls []string
-	deps := tmuxEditDeps{sendKeys: func(paneID string, keys ...string) error {
-		calls = append(calls, fmt.Sprintf("send:%s:%s", paneID, strings.Join(keys, ",")))
-		return nil
-	}}
-
-	err := deps.sendLines("%5", "hello", "S-Enter")
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-	if len(calls) != 1 {
-		t.Fatalf("got %d calls, want 1: %v", len(calls), calls)
-	}
-	if calls[0] != "send:%5:hello" {
-		t.Errorf("call[0] = %q, want text", calls[0])
-	}
-}
-
-func TestSendLines_MultiLine(t *testing.T) {
-	var calls []string
-	deps := tmuxEditDeps{sendKeys: func(paneID string, keys ...string) error {
-		calls = append(calls, strings.Join(keys, ","))
-		return nil
-	}}
-
-	err := deps.sendLines("%1", "line1\nline2\nline3", "S-Enter")
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-	want := []string{"line1", "S-Enter", "line2", "S-Enter", "line3"}
-	if len(calls) != len(want) {
-		t.Fatalf("got %d calls, want %d: %v", len(calls), len(want), calls)
-	}
-	for i, w := range want {
-		if calls[i] != w {
-			t.Errorf("call[%d] = %q, want %q", i, calls[i], w)
-		}
-	}
-}
-
-func TestSendLines_FallbackNewline(t *testing.T) {
-	var calls []string
-	deps := tmuxEditDeps{sendKeys: func(paneID string, keys ...string) error {
-		calls = append(calls, strings.Join(keys, ","))
-		return nil
-	}}
-
-	// Empty newlineKeys should fallback to "Enter"
-	err := deps.sendLines("%1", "a\nb", "")
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-	if len(calls) != 3 {
-		t.Fatalf("got %d calls, want 3: %v", len(calls), calls)
-	}
-	if calls[1] != "Enter" {
-		t.Errorf("newline key = %q, want Enter (fallback)", calls[1])
-	}
-}
-
-func TestSendLines_Error(t *testing.T) {
-	deps := tmuxEditDeps{sendKeys: func(string, ...string) error {
-		return fmt.Errorf("send failed")
-	}}
-
-	err := deps.sendLines("%1", "hello", "Enter")
-	if err == nil {
-		t.Fatal("expected error on send failure")
-	}
-}