feat: agregar config SharedKnowledge a schema.go

- Nuevo tipo SharedKnowledgeToolCfg con enabled, dir, db_path
- Agregar campo SharedKnowledge a ToolsCfg
- Issue 0018: Shared Knowledge (fase 1)

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

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

internal/config/schema.go

@@ -129,6 +129,7 @@ type ToolsCfg struct {
 	MCP             MCPToolCfg             `yaml:"mcp"`
 	Memory          MemoryToolCfg          `yaml:"memory"`
 	Knowledge       KnowledgeToolCfg       `yaml:"knowledge"`
+	SharedKnowledge SharedKnowledgeToolCfg `yaml:"shared_knowledge"`
 }
 
 type MatrixToolCfg struct {
@@ -140,6 +141,12 @@ type KnowledgeToolCfg struct {
 	Dir     string `yaml:"dir"` // default: "./knowledge" (relative to agent dir)
 }
 
+type SharedKnowledgeToolCfg struct {
+	Enabled bool   `yaml:"enabled"` // default false
+	Dir     string `yaml:"dir"`     // default "knowledges" (relative to project root)
+	DBPath  string `yaml:"db_path"` // default "knowledges/data/knowledge.db"
+}
+
 type SSHToolCfg struct {
 	Enabled             bool          `yaml:"enabled"`
 	AllowedTargets      []string      `yaml:"allowed_targets"`