feat(tools): implement CRUD operations for thoughts and projects

* Add tools for creating, retrieving, updating, and deleting thoughts.
* Implement project management tools for creating and listing projects.
* Introduce linking functionality between thoughts.
* Add search and recall capabilities for thoughts based on semantic queries.
* Implement statistics and summarization tools for thought analysis.
* Create database migrations for thoughts, projects, and links.
* Add helper functions for UUID parsing and project resolution.

internal/ai/compat/client_test.go

@@ -0,0 +1,91 @@
+package compat
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"log/slog"
+	"net/http"
+	"net/http/httptest"
+	"sync/atomic"
+	"testing"
+)
+
+func discardLogger() *slog.Logger {
+	return slog.New(slog.NewTextHandler(io.Discard, nil))
+}
+
+func TestEmbedRetriesTransientFailures(t *testing.T) {
+	var calls atomic.Int32
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if calls.Add(1) < 3 {
+			http.Error(w, "temporary failure", http.StatusServiceUnavailable)
+			return
+		}
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"data": []map[string]any{
+				{"embedding": []float32{1, 2, 3}},
+			},
+		})
+	}))
+	defer server.Close()
+
+	client := New(Config{
+		Name:           "test",
+		BaseURL:        server.URL,
+		APIKey:         "secret",
+		EmbeddingModel: "embed-model",
+		MetadataModel:  "meta-model",
+		HTTPClient:     server.Client(),
+		Log:            discardLogger(),
+		Dimensions:     3,
+	})
+
+	embedding, err := client.Embed(context.Background(), "hello")
+	if err != nil {
+		t.Fatalf("Embed() error = %v", err)
+	}
+	if len(embedding) != 3 {
+		t.Fatalf("embedding len = %d, want 3", len(embedding))
+	}
+	if got := calls.Load(); got != 3 {
+		t.Fatalf("call count = %d, want 3", got)
+	}
+}
+
+func TestExtractMetadataParsesCodeFencedJSON(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"choices": []map[string]any{
+				{
+					"message": map[string]any{
+						"content": "```json\n{\"people\":[\"Alice\"],\"action_items\":[],\"dates_mentioned\":[],\"topics\":[\"memory\"],\"type\":\"idea\",\"source\":\"mcp\"}\n```",
+					},
+				},
+			},
+		})
+	}))
+	defer server.Close()
+
+	client := New(Config{
+		Name:           "test",
+		BaseURL:        server.URL,
+		APIKey:         "secret",
+		EmbeddingModel: "embed-model",
+		MetadataModel:  "meta-model",
+		HTTPClient:     server.Client(),
+		Log:            discardLogger(),
+	})
+
+	metadata, err := client.ExtractMetadata(context.Background(), "hello")
+	if err != nil {
+		t.Fatalf("ExtractMetadata() error = %v", err)
+	}
+	if metadata.Type != "idea" {
+		t.Fatalf("metadata type = %q, want idea", metadata.Type)
+	}
+	if len(metadata.People) != 1 || metadata.People[0] != "Alice" {
+		t.Fatalf("metadata people = %#v, want [Alice]", metadata.People)
+	}
+}