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, 66 deletions

diff --git a/internal/tmuxedit/send.go b/internal/tmuxedit/send.go
deleted file mode 100644
index 2af7074..0000000
--- a/internal/tmuxedit/send.go
+++ /dev/null
@@ -1,66 +0,0 @@
-package tmuxedit
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-	"time"
-)
-
-func sendKeys(paneID string, keys ...string) error {
-	return tmuxEditDeps{}.send(paneID, keys...)
-}
-
-func (d tmuxEditDeps) send(paneID string, keys ...string) error {
-	if d.sendKeys != nil {
-		return d.sendKeys(paneID, keys...)
-	}
-	args := append([]string{"send-keys", "-t", paneID}, keys...)
-	_, err := d.command("tmux", args...)
-	if err != nil {
-		return fmt.Errorf("send-keys failed: %w", err)
-	}
-	return nil
-}
-
-func sendRepeatedKey(paneID, key string, count int) error {
-	return tmuxEditDeps{}.sendRepeated(paneID, key, count)
-}
-
-// sendRepeated uses `tmux send-keys -N <count>` for efficient bulk key repeats
-// (e.g. 200 backspaces).
-func (d tmuxEditDeps) sendRepeated(paneID, key string, count int) error {
-	if d.sendRepeatedKey != nil {
-		return d.sendRepeatedKey(paneID, key, count)
-	}
-	args := []string{"send-keys", "-t", paneID, "-N", strconv.Itoa(count), key}
-	_, err := d.command("tmux", args...)
-	if err != nil {
-		return fmt.Errorf("send-keys -N failed: %w", err)
-	}
-	return nil
-}
-
-func sleepAfterClear() { tmuxEditDeps{}.sleep() }
-
-func (d tmuxEditDeps) sleep() {
-	if d.sleepAfterClear != nil {
-		d.sleepAfterClear()
-		return
-	}
-	time.Sleep(300 * time.Millisecond)
-}
-
-// deduplicateText compares the original (pre-filled) text with what the user
-// returned from the editor. Returns empty string if unchanged (no-op), or
-// the full edited text if anything changed. The caller is responsible for
-// clearing existing pane input before sending the result, so we always return
-// the complete text rather than stripping the original prefix.
-func deduplicateText(original, edited string) string {
-	original = strings.TrimSpace(original)
-	edited = strings.TrimSpace(edited)
-	if edited == "" || edited == original {
-		return ""
-	}
-	return edited
-}