feat(learnings): add store and MCP tool layer

internal/mcpserver/server.go

@@ -40,6 +40,7 @@ type ToolSet struct {
 	Skills        *tools.SkillsTool
 	ChatHistory   *tools.ChatHistoryTool
 	Describe      *tools.DescribeTool
+	Learnings     *tools.LearningsTool
 }
 
 // Handlers groups the HTTP handlers produced for an MCP server instance.
@@ -83,6 +84,7 @@ func NewHandlers(cfg config.MCPConfig, logger *slog.Logger, toolSet ToolSet, onS
 		registerSystemTools,
 		registerThoughtTools,
 		registerProjectTools,
+		registerLearningTools,
 		registerFileTools,
 		registerMaintenanceTools,
 		registerSkillTools,
@@ -249,6 +251,28 @@ func registerProjectTools(server *mcp.Server, logger *slog.Logger, toolSet ToolS
 	return nil
 }
 
+func registerLearningTools(server *mcp.Server, logger *slog.Logger, toolSet ToolSet) error {
+	if err := addTool(server, logger, &mcp.Tool{
+		Name:        "add_learning",
+		Description: "Create a curated learning record distinct from raw thoughts.",
+	}, toolSet.Learnings.Add); err != nil {
+		return err
+	}
+	if err := addTool(server, logger, &mcp.Tool{
+		Name:        "get_learning",
+		Description: "Retrieve a structured learning by id.",
+	}, toolSet.Learnings.Get); err != nil {
+		return err
+	}
+	if err := addTool(server, logger, &mcp.Tool{
+		Name:        "list_learnings",
+		Description: "List structured learnings with optional project, status, priority, tag, and text filters.",
+	}, toolSet.Learnings.List); err != nil {
+		return err
+	}
+	return nil
+}
+
 func registerFileTools(server *mcp.Server, logger *slog.Logger, toolSet ToolSet) error {
 	server.AddResourceTemplate(&mcp.ResourceTemplate{
 		Name:        "stored_file",
@@ -477,6 +501,11 @@ func BuildToolCatalog() []tools.ToolEntry {
 		{Name: "get_active_project", Description: "Return the active project for the current MCP session. If your client does not preserve MCP sessions, pass project explicitly to project-scoped tools instead of relying on this.", Category: "projects"},
 		{Name: "get_project_context", Description: "Get recent and semantic context for a project. Uses the explicit project when provided, otherwise the active MCP session project. Falls back to full-text search when no embeddings exist.", Category: "projects"},
 
+		// learnings
+		{Name: "add_learning", Description: "Create a curated learning record distinct from raw thoughts.", Category: "projects"},
+		{Name: "get_learning", Description: "Retrieve a structured learning by id.", Category: "projects"},
+		{Name: "list_learnings", Description: "List structured learnings with optional project, category, area, status, priority, tag, and text filters.", Category: "projects"},
+
 		// files
 		{Name: "upload_file", Description: "Stage a file and get an amcs://files/{id} resource URI. Use content_path (absolute server-side path, no size limit) for large or binary files, or content_base64 (≤10 MB) for small files. Pass thought_id/project to link immediately, or omit and pass the URI to save_file later.", Category: "files"},
 		{Name: "save_file", Description: "Store a file and optionally link it to a thought. Use content_base64 (≤10 MB) for small files, or content_uri (amcs://files/{id} from a prior upload_file) for previously staged files. For files larger than 10 MB, use upload_file with content_path first. If the goal is to retain the artifact, store the file directly instead of reading or summarising it first.", Category: "files"},