Migrate to per-agent subdirectories, uniform 8-agent support, cross-platform fixes

- All paths use ~/.elydora/{agentId}/ per-agent isolation
- Add copilot, letta plugins; split kiro into kirocli + kiroide
- Remove augment (SDK-only agent, not one-click)
- Fix filepath.Join usage (replace string concatenation)
- Fix stale comment referencing old ~/.elydora/agents/ path
- Uniform 8 agents: claudecode, cursor, gemini, kirocli, kiroide, opencode, copilot, letta

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

cmd/elydora/plugins/letta.go

@@ -0,0 +1,222 @@
+package plugins
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// LettaPlugin manages the Elydora audit hook for Letta Code.
+// It merges PreToolUse/PostToolUse hooks into ~/.letta/settings.json.
+type LettaPlugin struct{}
+
+func (p *LettaPlugin) configPath() (string, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", fmt.Errorf("resolve home directory: %w", err)
+	}
+	return filepath.Join(home, ".letta", "settings.json"), nil
+}
+
+func (p *LettaPlugin) Install(config InstallConfig) error {
+	scriptPath, err := hookScriptPath(config.AgentID)
+	if err != nil {
+		return err
+	}
+	if config.HookScript != "" {
+		scriptPath = config.HookScript
+	}
+
+	if err := GenerateHookScript(scriptPath, config); err != nil {
+		return fmt.Errorf("generate hook script: %w", err)
+	}
+
+	guardPath := config.GuardScriptPath
+	if guardPath == "" {
+		guardPath, err = guardScriptPath(config.AgentID)
+		if err != nil {
+			return err
+		}
+	}
+
+	configPath, err := p.configPath()
+	if err != nil {
+		return err
+	}
+
+	settings, err := readJSONFile(configPath)
+	if err != nil {
+		return err
+	}
+
+	hooks, _ := settings["hooks"].(map[string]interface{})
+	if hooks == nil {
+		hooks = make(map[string]interface{})
+	}
+
+	// --- PreToolUse (guard — freeze enforcement) ---
+	preToolUse, _ := hooks["PreToolUse"].([]interface{})
+	var preFiltered []interface{}
+	for _, entry := range preToolUse {
+		if m, ok := entry.(map[string]interface{}); ok {
+			if isElydoraHookEntry(m) {
+				continue
+			}
+		}
+		preFiltered = append(preFiltered, entry)
+	}
+	guardEntry := map[string]interface{}{
+		"matcher": "*",
+		"hooks": []interface{}{
+			map[string]interface{}{
+				"type":    "command",
+				"command": "node " + guardPath,
+			},
+		},
+	}
+	preFiltered = append(preFiltered, guardEntry)
+	hooks["PreToolUse"] = preFiltered
+
+	// --- PostToolUse (audit logging) ---
+	postToolUse, _ := hooks["PostToolUse"].([]interface{})
+	var postFiltered []interface{}
+	for _, entry := range postToolUse {
+		if m, ok := entry.(map[string]interface{}); ok {
+			if isElydoraHookEntry(m) {
+				continue
+			}
+		}
+		postFiltered = append(postFiltered, entry)
+	}
+	hookEntry := map[string]interface{}{
+		"matcher": "*",
+		"hooks": []interface{}{
+			map[string]interface{}{
+				"type":    "command",
+				"command": "node " + scriptPath,
+			},
+		},
+	}
+	postFiltered = append(postFiltered, hookEntry)
+	hooks["PostToolUse"] = postFiltered
+
+	settings["hooks"] = hooks
+
+	if err := writeJSONFile(configPath, settings); err != nil {
+		return err
+	}
+	fmt.Printf("Installed Elydora hook for Letta Code at %s\n", configPath)
+	return nil
+}
+
+func (p *LettaPlugin) Uninstall(agentID string) error {
+	configPath, err := p.configPath()
+	if err != nil {
+		return err
+	}
+
+	settings, err := readJSONFile(configPath)
+	if err != nil {
+		return err
+	}
+
+	hooks, _ := settings["hooks"].(map[string]interface{})
+	if hooks == nil {
+		fmt.Println("No Letta Code hooks found.")
+		return nil
+	}
+
+	// Remove PreToolUse Elydora entries
+	preToolUse, _ := hooks["PreToolUse"].([]interface{})
+	var preFiltered []interface{}
+	for _, entry := range preToolUse {
+		if m, ok := entry.(map[string]interface{}); ok {
+			if isElydoraHookEntry(m) {
+				continue
+			}
+		}
+		preFiltered = append(preFiltered, entry)
+	}
+	if len(preFiltered) == 0 {
+		delete(hooks, "PreToolUse")
+	} else {
+		hooks["PreToolUse"] = preFiltered
+	}
+
+	// Remove PostToolUse Elydora entries
+	postToolUse, _ := hooks["PostToolUse"].([]interface{})
+	var postFiltered []interface{}
+	for _, entry := range postToolUse {
+		if m, ok := entry.(map[string]interface{}); ok {
+			if isElydoraHookEntry(m) {
+				continue
+			}
+		}
+		postFiltered = append(postFiltered, entry)
+	}
+	if len(postFiltered) == 0 {
+		delete(hooks, "PostToolUse")
+	} else {
+		hooks["PostToolUse"] = postFiltered
+	}
+
+	if len(hooks) == 0 {
+		delete(settings, "hooks")
+	} else {
+		settings["hooks"] = hooks
+	}
+
+	if err := writeJSONFile(configPath, settings); err != nil {
+		return err
+	}
+
+	if agentID != "" {
+		scriptPath, _ := hookScriptPath(agentID)
+		if scriptPath != "" {
+			os.Remove(scriptPath)
+		}
+		gPath, _ := guardScriptPath(agentID)
+		if gPath != "" {
+			os.Remove(gPath)
+		}
+	}
+	fmt.Println("Uninstalled Elydora hook for Letta Code.")
+	return nil
+}
+
+func (p *LettaPlugin) Status() (PluginStatus, error) {
+	configPath, err := p.configPath()
+	if err != nil {
+		return PluginStatus{}, err
+	}
+
+	status := PluginStatus{
+		AgentName:   "letta",
+		DisplayName: "Letta Code",
+		ConfigPath:  configPath,
+	}
+
+	settings, err := readJSONFile(configPath)
+	if err != nil {
+		return status, nil
+	}
+
+	hooks, _ := settings["hooks"].(map[string]interface{})
+	if hooks != nil {
+		preConfigured := hasElydoraEntry(hooks["PreToolUse"])
+		postConfigured := hasElydoraEntry(hooks["PostToolUse"])
+		status.HookConfigured = preConfigured && postConfigured
+
+		// Extract hook script path from the configured command
+		scriptPath := extractElydoraScriptPath(hooks["PostToolUse"])
+		if scriptPath != "" {
+			if _, err := os.Stat(scriptPath); err == nil {
+				status.HookScriptExists = true
+			}
+		}
+	}
+
+	status.Installed = status.HookConfigured && status.HookScriptExists
+	return status, nil
+}
+