feat: remove tmux edit popup support for Claude Code

Claude Code CLI now supports Ctrl+G to open the prompt in EDITOR
(like OpenAI Codex CLI), making the built-in hexai-tmux-edit agent
profile redundant.

- Remove internal/tmuxedit/claude_agent.go and its tests
- Update builtinAgents() to exclude claude; built-ins are now: cursor, amp, aider
- Update all documentation (README, docs/tmux.md, docs/usage.md, docs/configuration.md)
- Update config.toml.example to reflect new agent list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/internal/tmuxedit/agentutil.go b/internal/tmuxedit/agentutil.go
index 18ece9b..67351d3 100644
--- a/internal/tmuxedit/agentutil.go
+++ b/internal/tmuxedit/agentutil.go
@@ -65,9 +65,9 @@ func joinLastContiguousBlock(matches []promptMatch, strips []string) string {
 }
 
 // scopeToLastSection extracts the content between the last two lines matching
-// the section delimiter pattern. This isolates the prompt area (e.g. Claude's
-// ─── rules) from previous conversation content. Returns the full content if
-// no pattern is set or fewer than two delimiters are found.
+// the section delimiter pattern. This isolates the prompt area from previous
+// conversation content. Returns the full content if no pattern is set or
+// fewer than two delimiters are found.
 func scopeToLastSection(paneContent, sectionPattern string) string {
 	if sectionPattern == "" {
 		return paneContent
@@ -118,7 +118,7 @@ func sendClearSequence(paneID, clearKeys string) error {
 				return fmt.Errorf("clear key %q failed: %w", key, err)
 			}
 		}
-		// Add delay after Escape to let Vim/Claude exit INSERT mode
+		// Add delay after Escape to let Vim-based agents exit INSERT mode
 		if key == "Escape" {
 			time.Sleep(150 * time.Millisecond)
 		}