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, 23 deletions

diff --git a/internal/tmuxedit/capture.go b/internal/tmuxedit/capture.go
deleted file mode 100644
index f4e3a67..0000000
--- a/internal/tmuxedit/capture.go
+++ /dev/null
@@ -1,23 +0,0 @@
-package tmuxedit
-
-import (
-	"fmt"
-	"strings"
-)
-
-func capturePane(paneID string) (string, error) {
-	return tmuxEditDeps{}.capture(paneID)
-}
-
-// capture retrieves the visible content of a tmux pane via `tmux capture-pane
-// -p -t <paneID>`. The -p flag prints to stdout instead of to a paste buffer.
-func (d tmuxEditDeps) capture(paneID string) (string, error) {
-	if d.capturePane != nil {
-		return d.capturePane(paneID)
-	}
-	out, err := d.command("tmux", "capture-pane", "-p", "-t", paneID)
-	if err != nil {
-		return "", fmt.Errorf("capture-pane failed for %s: %w", paneID, err)
-	}
-	return strings.TrimRight(string(out), "\n"), nil
-}