Initial commit: smartrun MVP

Garmin run classification and progression tracker. Go backend (MCP
client to mcp-garmin, SQLite store, deterministic rule engine, REST
API) and React/TS frontend (Dashboard, Review Queue, Workout Kinds).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/internal/garmin/mock/mock.go

@@ -0,0 +1,76 @@
+// Package mock provides a fake garmin.Client for tests and frontend/dev
+// work without a live Garmin account or the mcp-garmin subprocess.
+package mock
+
+import (
+	"context"
+
+	"smartrun/backend/internal/garmin"
+)
+
+// Client is a fake garmin.Client returning data supplied by the test/caller.
+type Client struct {
+	AuthResults        []garmin.AuthResult // consumed in order by Authenticate/CompleteMFA calls
+	Activities         []garmin.Activity
+	Splits             map[int64]garmin.ActivitySplits
+	Details            map[int64]garmin.ActivityDetails
+	Err                error // if set, every call returns this error
+	authResultCursor   int
+	ClosedCalled       bool
+	GetActivitiesCalls int
+}
+
+var _ garmin.Client = (*Client)(nil)
+
+func (c *Client) nextAuthResult() garmin.AuthResult {
+	if c.authResultCursor >= len(c.AuthResults) {
+		return garmin.AuthResult{Status: garmin.AuthSuccess, Message: "Authenticated successfully."}
+	}
+	r := c.AuthResults[c.authResultCursor]
+	c.authResultCursor++
+	return r
+}
+
+func (c *Client) Authenticate(ctx context.Context) (garmin.AuthResult, error) {
+	if c.Err != nil {
+		return garmin.AuthResult{}, c.Err
+	}
+	return c.nextAuthResult(), nil
+}
+
+func (c *Client) CompleteMFA(ctx context.Context, code string) (garmin.AuthResult, error) {
+	if c.Err != nil {
+		return garmin.AuthResult{}, c.Err
+	}
+	return c.nextAuthResult(), nil
+}
+
+func (c *Client) GetActivities(ctx context.Context, startDate, endDate string, limit int) ([]garmin.Activity, error) {
+	c.GetActivitiesCalls++
+	if c.Err != nil {
+		return nil, c.Err
+	}
+	if limit > 0 && limit < len(c.Activities) {
+		return c.Activities[:limit], nil
+	}
+	return c.Activities, nil
+}
+
+func (c *Client) GetActivitySplits(ctx context.Context, activityID int64) (garmin.ActivitySplits, error) {
+	if c.Err != nil {
+		return garmin.ActivitySplits{}, c.Err
+	}
+	return c.Splits[activityID], nil
+}
+
+func (c *Client) GetActivityDetails(ctx context.Context, activityID int64) (garmin.ActivityDetails, error) {
+	if c.Err != nil {
+		return garmin.ActivityDetails{}, c.Err
+	}
+	return c.Details[activityID], nil
+}
+
+func (c *Client) Close() error {
+	c.ClosedCalled = true
+	return nil
+}