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/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"flag"
 	"fmt"
 	"os"
@@ -91,12 +92,12 @@ func cmdInstall(args []string) {
 	}
 
 	// Generate guard script (PreToolUse — freeze enforcement)
-	guardScriptPath, err := guardScriptPathForAgent(*agent)
+	guardScriptPath, err := guardScriptPathForAgent(*agentID)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 		os.Exit(1)
 	}
-	guardScript := plugins.GenerateGuardScript(*agent)
+	guardScript := plugins.GenerateGuardScript(*agent, *agentID)
 	if err := os.MkdirAll(filepath.Dir(guardScriptPath), 0755); err != nil {
 		fmt.Fprintf(os.Stderr, "Error creating guard script directory: %v\n", err)
 		os.Exit(1)
@@ -131,6 +132,7 @@ func cmdInstall(args []string) {
 func cmdUninstall(args []string) {
 	fs := flag.NewFlagSet("uninstall", flag.ExitOnError)
 	agent := fs.String("agent", "", "Agent name (required)")
+	agentID := fs.String("agent-id", "", "Agent ID (if omitted, scans ~/.elydora/*/config.json for matching agent_name)")
 
 	fs.Parse(args)
 
@@ -147,18 +149,66 @@ func cmdUninstall(args []string) {
 		os.Exit(1)
 	}
 
-	if err := plugin.Uninstall(); err != nil {
+	// Resolve agentID: if not given, scan ~/.elydora/*/config.json for matching agent_name
+	resolvedAgentID := *agentID
+	if resolvedAgentID == "" {
+		resolvedAgentID = findAgentIDByName(*agent)
+		if resolvedAgentID == "" {
+			fmt.Fprintf(os.Stderr, "Warning: could not find agent ID for %q in ~/.elydora/*/config.json\n", *agent)
+		}
+	}
+
+	if err := plugin.Uninstall(resolvedAgentID); err != nil {
 		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 		os.Exit(1)
 	}
 
-	// Also remove the guard script
-	guardPath, _ := guardScriptPathForAgent(*agent)
-	if guardPath != "" {
-		os.Remove(guardPath)
+	// Remove the per-agent directory
+	if resolvedAgentID != "" {
+		home, err := os.UserHomeDir()
+		if err == nil {
+			agentDir := filepath.Join(home, ".elydora", resolvedAgentID)
+			if err := os.RemoveAll(agentDir); err != nil {
+				fmt.Fprintf(os.Stderr, "Warning: failed to remove agent directory %s: %v\n", agentDir, err)
+			} else {
+				fmt.Printf("  Removed agent directory: %s\n", agentDir)
+			}
+		}
 	}
 }
 
+// findAgentIDByName scans ~/.elydora/*/config.json for a config whose agent_name
+// matches the given name and returns the directory name (agent ID).
+func findAgentIDByName(agentName string) string {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return ""
+	}
+	elydoraDir := filepath.Join(home, ".elydora")
+	entries, err := os.ReadDir(elydoraDir)
+	if err != nil {
+		return ""
+	}
+	for _, entry := range entries {
+		if !entry.IsDir() {
+			continue
+		}
+		configPath := filepath.Join(elydoraDir, entry.Name(), "config.json")
+		data, err := os.ReadFile(configPath)
+		if err != nil {
+			continue
+		}
+		var config map[string]interface{}
+		if err := json.Unmarshal(data, &config); err != nil {
+			continue
+		}
+		if name, _ := config["agent_name"].(string); name == agentName {
+			return entry.Name()
+		}
+	}
+	return ""
+}
+
 // ---------------------------------------------------------------------------
 // status
 // ---------------------------------------------------------------------------
@@ -219,7 +269,7 @@ func cmdAgents() {
 	names := sortedAgentNames()
 	for _, name := range names {
 		entry := plugins.SupportedAgents[name]
-		configPath := entry.ConfigDir + "/" + entry.ConfigFile
+		configPath := entry.ConfigDir + "/" + entry.ConfigFile // display only, not a filesystem path
 		fmt.Printf("  %-14s  %-20s  %s\n", name, entry.Name, configPath)
 	}
 }
@@ -233,11 +283,11 @@ func sortedAgentNames() []string {
 	return names
 }
 
-// guardScriptPathForAgent returns the path to ~/.elydora/hooks/<agent>-guard.js.
-func guardScriptPathForAgent(agentName string) (string, error) {
+// guardScriptPathForAgent returns the path to ~/.elydora/<agentId>/guard.js.
+func guardScriptPathForAgent(agentId string) (string, error) {
 	home, err := os.UserHomeDir()
 	if err != nil {
 		return "", fmt.Errorf("resolve home directory: %w", err)
 	}
-	return filepath.Join(home, ".elydora", "hooks", agentName+"-guard.js"), nil
+	return filepath.Join(home, ".elydora", agentId, "guard.js"), nil
 }