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, 135 deletions

diff --git a/internal/tmuxedit/config_agent.go b/internal/tmuxedit/config_agent.go
deleted file mode 100644
index 0c52c3d..0000000
--- a/internal/tmuxedit/config_agent.go
+++ /dev/null
@@ -1,135 +0,0 @@
-package tmuxedit
-
-import (
-	"strings"
-
-	"codeberg.org/snonux/hexai/internal/appconfig"
-)
-
-// configAgent uses baseAgent defaults for all operations. It serves
-// user-defined agents from TOML config and simple built-ins (amp, aider)
-// that don't need specialized extraction or clearing logic.
-type configAgent struct{ baseAgent }
-
-// builtinAgents returns the default set of agent implementations. Order
-// matters: agents with distinctive UI elements (box-drawing, etc.) are
-// checked first to avoid false positives from model names like "Claude
-// 4.5 Sonnet" appearing in other agents' panes.
-// Claude Code is not included here: it now supports opening the prompt
-// in an external editor natively via Ctrl+G (like OpenAI Codex CLI).
-func builtinAgents() []Agent {
-	return []Agent{
-		newCursorAgent(),
-		&configAgent{baseAgent{
-			name:          "amp",
-			displayName:   "Amp",
-			detectPattern: `(?i)(amp|sourcegraph)`,
-			promptPat:     `(?m)│\s*(.+?)\s*│\s*$`,
-			clearFirst:    true,
-			clearKeys:     "C-u",
-			newlineKeys:   "S-Enter",
-			submitKeys:    "Enter",
-		}},
-		&configAgent{baseAgent{
-			name:          "aider",
-			displayName:   "Aider",
-			detectPattern: `(?i)aider`,
-			promptPat:     `(?m)>\s*(.+)$`,
-			clearFirst:    true,
-			clearKeys:     "C-u",
-			newlineKeys:   "",
-			submitKeys:    "Enter",
-		}},
-	}
-}
-
-// genericAgent returns a fallback agent with no detection or prompt extraction.
-// The user gets a blank editor and text is sent verbatim.
-func genericAgent() Agent {
-	return &configAgent{baseAgent{
-		name:        "generic",
-		displayName: "Generic",
-		newlineKeys: "",
-		submitKeys:  "Enter",
-	}}
-}
-
-// resolveAgents merges built-in agent defaults with user-provided overrides
-// from config. Agents are matched by name (case-insensitive); user config
-// wins field-by-field over builtins. The Configurable interface provides
-// access to baseAgent fields for merging.
-func resolveAgents(cfgAgents []appconfig.TmuxEditAgentCfg) []Agent {
-	agents := builtinAgents()
-	for _, ca := range cfgAgents {
-		merged := false
-		for i, a := range agents {
-			if !strings.EqualFold(a.Name(), ca.Name) {
-				continue
-			}
-			if c, ok := a.(Configurable); ok {
-				mergeAgentConfig(c.Base(), ca)
-			}
-			merged = true
-			_ = i // index not needed; we modify through the pointer
-			break
-		}
-		if !merged {
-			agents = append(agents, agentFromConfig(ca))
-		}
-	}
-	return agents
-}
-
-// mergeAgentConfig overrides fields in base with non-zero values from cfg.
-// It modifies the baseAgent in place via pointer.
-func mergeAgentConfig(base *baseAgent, cfg appconfig.TmuxEditAgentCfg) {
-	if s := strings.TrimSpace(cfg.DisplayName); s != "" {
-		base.displayName = s
-	}
-	if s := strings.TrimSpace(cfg.DetectPattern); s != "" {
-		base.detectPattern = s
-	}
-	if s := strings.TrimSpace(cfg.SectionPattern); s != "" {
-		base.sectionPat = s
-	}
-	if s := strings.TrimSpace(cfg.PromptPattern); s != "" {
-		base.promptPat = s
-	}
-	if len(cfg.StripPatterns) > 0 {
-		base.stripPatterns = cfg.StripPatterns
-	}
-	if cfg.ClearFirst != nil {
-		base.clearFirst = *cfg.ClearFirst
-	}
-	if s := strings.TrimSpace(cfg.ClearKeys); s != "" {
-		base.clearKeys = s
-	}
-	if s := strings.TrimSpace(cfg.NewlineKeys); s != "" {
-		base.newlineKeys = s
-	}
-	if s := strings.TrimSpace(cfg.SubmitKeys); s != "" {
-		base.submitKeys = s
-	}
-}
-
-// agentFromConfig creates a new configAgent from a user config entry.
-func agentFromConfig(cfg appconfig.TmuxEditAgentCfg) Agent {
-	b := baseAgent{
-		name:          strings.TrimSpace(cfg.Name),
-		displayName:   strings.TrimSpace(cfg.DisplayName),
-		detectPattern: strings.TrimSpace(cfg.DetectPattern),
-		sectionPat:    strings.TrimSpace(cfg.SectionPattern),
-		promptPat:     strings.TrimSpace(cfg.PromptPattern),
-		stripPatterns: cfg.StripPatterns,
-		clearKeys:     strings.TrimSpace(cfg.ClearKeys),
-		newlineKeys:   strings.TrimSpace(cfg.NewlineKeys),
-		submitKeys:    strings.TrimSpace(cfg.SubmitKeys),
-	}
-	if cfg.ClearFirst != nil {
-		b.clearFirst = *cfg.ClearFirst
-	}
-	if b.displayName == "" {
-		b.displayName = b.name
-	}
-	return &configAgent{b}
-}