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/cursor.go

@@ -20,7 +20,7 @@ func (p *CursorPlugin) configPath() (string, error) {
 }
 
 func (p *CursorPlugin) Install(config InstallConfig) error {
-	scriptPath, err := hookScriptPath("cursor")
+	scriptPath, err := hookScriptPath(config.AgentID)
 	if err != nil {
 		return err
 	}
@@ -34,7 +34,7 @@ func (p *CursorPlugin) Install(config InstallConfig) error {
 
 	guardPath := config.GuardScriptPath
 	if guardPath == "" {
-		guardPath, err = guardScriptPath("cursor")
+		guardPath, err = guardScriptPath(config.AgentID)
 		if err != nil {
 			return err
 		}
@@ -99,12 +99,7 @@ func (p *CursorPlugin) Install(config InstallConfig) error {
 	return nil
 }
 
-func (p *CursorPlugin) Uninstall() error {
-	scriptPath, err := hookScriptPath("cursor")
-	if err != nil {
-		return err
-	}
-
+func (p *CursorPlugin) Uninstall(agentID string) error {
 	configPath, err := p.configPath()
 	if err != nil {
 		return err
@@ -165,21 +160,21 @@ func (p *CursorPlugin) Uninstall() error {
 		return err
 	}
 
-	os.Remove(scriptPath)
-	gPath, _ := guardScriptPath("cursor")
-	if gPath != "" {
-		os.Remove(gPath)
+	if agentID != "" {
+		scriptPath, _ := hookScriptPath(agentID)
+		if scriptPath != "" {
+			os.Remove(scriptPath)
+		}
+		gPath, _ := guardScriptPath(agentID)
+		if gPath != "" {
+			os.Remove(gPath)
+		}
 	}
 	fmt.Println("Uninstalled Elydora hook for Cursor.")
 	return nil
 }
 
 func (p *CursorPlugin) Status() (PluginStatus, error) {
-	scriptPath, err := hookScriptPath("cursor")
-	if err != nil {
-		return PluginStatus{}, err
-	}
-
 	configPath, err := p.configPath()
 	if err != nil {
 		return PluginStatus{}, err
@@ -191,10 +186,6 @@ func (p *CursorPlugin) Status() (PluginStatus, error) {
 		ConfigPath:  configPath,
 	}
 
-	if _, err := os.Stat(scriptPath); err == nil {
-		status.HookScriptExists = true
-	}
-
 	settings, err := readJSONFile(configPath)
 	if err != nil {
 		return status, nil
@@ -205,12 +196,33 @@ func (p *CursorPlugin) Status() (PluginStatus, error) {
 		preConfigured := hasCursorElydoraEntry(hooks["preToolUse"])
 		postConfigured := hasCursorElydoraEntry(hooks["postToolUse"])
 		status.HookConfigured = preConfigured && postConfigured
+
+		// Extract hook script path from the configured command
+		scriptPath := extractCursorElydoraScriptPath(hooks["postToolUse"])
+		if scriptPath != "" {
+			if _, err := os.Stat(scriptPath); err == nil {
+				status.HookScriptExists = true
+			}
+		}
 	}
 
 	status.Installed = status.HookConfigured && status.HookScriptExists
 	return status, nil
 }
 
+// extractCursorElydoraScriptPath extracts the script path from a Cursor hook array's Elydora command entry.
+func extractCursorElydoraScriptPath(hookArray interface{}) string {
+	arr, _ := hookArray.([]interface{})
+	for _, entry := range arr {
+		if m, ok := entry.(map[string]interface{}); ok {
+			if cmd, _ := m["command"].(string); strings.Contains(cmd, "elydora") {
+				return extractPathFromNodeCommand(cmd)
+			}
+		}
+	}
+	return ""
+}
+
 // hasCursorElydoraEntry checks if a Cursor hook array (flat format) contains an Elydora entry.
 func hasCursorElydoraEntry(hookArray interface{}) bool {
 	arr, _ := hookArray.([]interface{})