feat: integrar shared knowledge store en runtime

- Agregar campo sharedKnowledgeStore al Agent struct
- Inicializar shared store si cfg.Tools.SharedKnowledge.Enabled
- Registrar shared tools en buildToolRegistry
- Cerrar shared store en Run defer
- Defaults: dir=knowledges, db=knowledges/data/knowledge.db
- Issue 0018: Shared Knowledge (fase 3)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

agents/runtime.go

@@ -92,6 +92,9 @@ type Agent struct {
 	// Knowledge store — non-nil when knowledge is enabled
 	knowledgeStore *shellknowledge.FileStore
 
+	// Shared knowledge store — non-nil when shared_knowledge is enabled
+	sharedKnowledgeStore *shellknowledge.FileStore
+
 	// Sanitization options — nil when sanitization is disabled
 	sanitizeOpts *sanitize.Options
 
@@ -235,6 +238,29 @@ func New(cfg *config.AgentConfig, rules []decision.Rule, agentACL acl.ACL, logge
 		}
 	}
 
+	// Shared knowledge store
+	var sharedKStore *shellknowledge.FileStore
+	if cfg.Tools.SharedKnowledge.Enabled {
+		sharedDir := cfg.Tools.SharedKnowledge.Dir
+		if sharedDir == "" {
+			sharedDir = "knowledges"
+		}
+		sharedDBPath := cfg.Tools.SharedKnowledge.DBPath
+		if sharedDBPath == "" {
+			sharedDBPath = "knowledges/data/knowledge.db"
+		}
+		var skErr error
+		sharedKStore, skErr = shellknowledge.New(sharedDir, sharedDBPath, logger)
+		if skErr != nil {
+			logger.Error("shared_knowledge_store_init_failed", "err", skErr)
+		} else {
+			if syncErr := sharedKStore.Sync(context.Background()); syncErr != nil {
+				logger.Error("shared_knowledge_sync_failed", "err", syncErr)
+			}
+			logger.Info("shared knowledge enabled", "dir", sharedDir, "db", sharedDBPath)
+		}
+	}
+
 	if !agentACL.Empty() {
 		logger.Info("acl enabled (centralized security policy)")
 	}
@@ -252,7 +278,7 @@ func New(cfg *config.AgentConfig, rules []decision.Rule, agentACL acl.ACL, logge
 	}
 
 	// Tool registry — register tools enabled in config
-	toolReg := buildToolRegistry(cfg, sshExec, matrixClient, memStore, kStore, mcpManager, roomCtx, logger)
+	toolReg := buildToolRegistry(cfg, sshExec, matrixClient, memStore, kStore, sharedKStore, mcpManager, roomCtx, logger)
 
 	// Rate limiting for tools
 	if cfg.Security.ToolRateLimit.Enabled {
@@ -278,25 +304,26 @@ func New(cfg *config.AgentConfig, rules []decision.Rule, agentACL acl.ACL, logge
 	}
 
 	a := &Agent{
-		cfg:         cfg,
-		acl:         agentACL,
-		rules:       rules,
-		llm:         llmFunc,
-		matrix:      matrixClient,
-		runner:      runner,
-		toolReg:     toolReg,
-		logger:      logger,
-		cryptoStore: cryptoStore,
-		mcpManager:  mcpManager,
-		done:        make(chan struct{}),
-		commands:       make(map[string]CommandHandler),
-		cmdAliases:     command.BuiltinNames(),
-		startTime:      time.Now(),
-		windows:        make(map[string]memory.Window),
-		memStore:       memStore,
-		knowledgeStore: kStore,
-		windowSize:     windowSize,
-		roomCtx:        roomCtx,
+		cfg:                  cfg,
+		acl:                  agentACL,
+		rules:                rules,
+		llm:                  llmFunc,
+		matrix:               matrixClient,
+		runner:               runner,
+		toolReg:              toolReg,
+		logger:               logger,
+		cryptoStore:          cryptoStore,
+		mcpManager:           mcpManager,
+		done:                 make(chan struct{}),
+		commands:             make(map[string]CommandHandler),
+		cmdAliases:           command.BuiltinNames(),
+		startTime:            time.Now(),
+		windows:              make(map[string]memory.Window),
+		memStore:             memStore,
+		knowledgeStore:       kStore,
+		sharedKnowledgeStore: sharedKStore,
+		windowSize:           windowSize,
+		roomCtx:              roomCtx,
 	}
 
 	// Configure sanitization if enabled
@@ -417,6 +444,9 @@ func (a *Agent) Run(ctx context.Context) error {
 	if a.knowledgeStore != nil {
 		defer a.knowledgeStore.Close()
 	}
+	if a.sharedKnowledgeStore != nil {
+		defer a.sharedKnowledgeStore.Close()
+	}
 	if a.mcpManager != nil {
 		defer a.mcpManager.Close()
 	}
@@ -999,6 +1029,7 @@ func buildToolRegistry(
 	matrixClient *matrix.Client,
 	memStore memory.Store,
 	kStore *shellknowledge.FileStore,
+	sharedKStore *shellknowledge.FileStore,
 	mcpManager *shellmcp.Manager,
 	roomCtx *toolmemory.RoomContext,
 	logger *slog.Logger,
@@ -1051,6 +1082,15 @@ func buildToolRegistry(
 		logger.Debug("registered knowledge tools")
 	}
 
+	// Shared knowledge tools
+	if cfg.Tools.SharedKnowledge.Enabled && sharedKStore != nil {
+		sharedTools := toolknowledge.NewSharedKnowledgeTools(sharedKStore)
+		for _, tool := range sharedTools {
+			reg.Register(tool)
+		}
+		logger.Debug("registered shared knowledge tools", "count", len(sharedTools))
+	}
+
 	// MCP tools — register tools from all connected MCP servers
 	if mcpManager != nil {
 		for serverName, mcpClient := range mcpManager.AllClients() {