Rename the app from tracker to fit

The directory, the repo and the hostname are all fit; the module path,
the image, the namespace and the data file were still tracker. Nothing
is deployed yet, so this is free now and would not be later.

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

internal/config/config.go

@@ -24,7 +24,7 @@ func Load() (*Config, error) {
 	c := &Config{
 		Addr:     env("ADDR", ":8080"),
 		BaseURL:  strings.TrimRight(env("BASE_URL", "http://localhost:8080"), "/"),
-		DataPath: env("DATA_PATH", "data/tracker.json"),
+		DataPath: env("DATA_PATH", "data/fit.json"),
 	}
 
 	// The whole app is date arithmetic, so a wrong timezone silently logs

internal/store/store.go

@@ -284,7 +284,7 @@ func (s *Store) Export() ([]byte, error) {
 func (s *Store) Import(body []byte) error {
 	var next data
 	if err := json.Unmarshal(body, &next); err != nil {
-		return fmt.Errorf("that file is not a tracker export: %w", err)
+		return fmt.Errorf("that file is not a fit export: %w", err)
 	}
 	if next.Days == nil {
 		next.Days = map[string]*Day{}
@@ -313,7 +313,7 @@ func (s *Store) persist() error {
 	}
 
 	dir := filepath.Dir(s.path)
-	tmp, err := os.CreateTemp(dir, ".tracker-*.json")
+	tmp, err := os.CreateTemp(dir, ".fit-*.json")
 	if err != nil {
 		return fmt.Errorf("create temp file: %w", err)
 	}

internal/store/store_test.go

@@ -96,7 +96,7 @@ func TestMarks(t *testing.T) {
 }
 
 func TestSaveAndReopen(t *testing.T) {
-	path := filepath.Join(t.TempDir(), "nested", "tracker.json")
+	path := filepath.Join(t.TempDir(), "nested", "fit.json")
 
 	st, err := Open(path)
 	if err != nil {
@@ -128,7 +128,7 @@ func TestSaveAndReopen(t *testing.T) {
 }
 
 func TestSaveEmptyDayRemovesIt(t *testing.T) {
-	path := filepath.Join(t.TempDir(), "tracker.json")
+	path := filepath.Join(t.TempDir(), "fit.json")
 	st, _ := Open(path)
 
 	if err := st.SaveDay(Day{Date: "2026-07-01", Workout: true}); err != nil {
@@ -145,7 +145,7 @@ func TestSaveEmptyDayRemovesIt(t *testing.T) {
 // A day handed out must not share memory with the stored one, or editing the
 // copy would quietly rewrite history.
 func TestDayIsACopy(t *testing.T) {
-	path := filepath.Join(t.TempDir(), "tracker.json")
+	path := filepath.Join(t.TempDir(), "fit.json")
 	st, _ := Open(path)
 	st.SaveDay(Day{Date: "2026-07-01", Protein: ptr(190)})
 
@@ -158,7 +158,7 @@ func TestDayIsACopy(t *testing.T) {
 }
 
 func TestOpenRefusesUnreadableFile(t *testing.T) {
-	path := filepath.Join(t.TempDir(), "tracker.json")
+	path := filepath.Join(t.TempDir(), "fit.json")
 	if err := os.WriteFile(path, []byte("{not json"), 0o644); err != nil {
 		t.Fatal(err)
 	}
@@ -168,7 +168,7 @@ func TestOpenRefusesUnreadableFile(t *testing.T) {
 }
 
 func TestDaysFillsGaps(t *testing.T) {
-	path := filepath.Join(t.TempDir(), "tracker.json")
+	path := filepath.Join(t.TempDir(), "fit.json")
 	st, _ := Open(path)
 	st.SaveSettings(settings())
 	st.SaveDay(Day{Date: "2026-06-22", Workout: true})
@@ -189,7 +189,7 @@ func TestDaysFillsGaps(t *testing.T) {
 }
 
 func TestImportRejectsJunkDates(t *testing.T) {
-	path := filepath.Join(t.TempDir(), "tracker.json")
+	path := filepath.Join(t.TempDir(), "fit.json")
 	st, _ := Open(path)
 	if err := st.Import([]byte(`{"days":{"last tuesday":{"workout":true}}}`)); err == nil {
 		t.Fatal("Import accepted a key that is not a date")

internal/web/handlers.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/scottyah/tracker/internal/store"
+	"github.com/scottyah/fit/internal/store"
 )
 
 // gratitudeMax caps one gratitude line. It is a line, not an essay, and a cap
@@ -250,7 +250,7 @@ func (s *Server) handleExport(w http.ResponseWriter, r *http.Request) {
 		s.fail(w, http.StatusInternalServerError, "The export did not build: "+err.Error())
 		return
 	}
-	name := "tracker-" + s.today() + ".json"
+	name := "fit-" + s.today() + ".json"
 	w.Header().Set("Content-Type", "application/json")
 	w.Header().Set("Content-Disposition", `attachment; filename="`+name+`"`)
 	w.Write(body)

internal/web/web.go

@@ -10,8 +10,8 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/scottyah/tracker/internal/config"
-	"github.com/scottyah/tracker/internal/store"
+	"github.com/scottyah/fit/internal/config"
+	"github.com/scottyah/fit/internal/store"
 )
 
 //go:embed templates/*.html

internal/web/web_test.go

@@ -9,8 +9,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/scottyah/tracker/internal/config"
-	"github.com/scottyah/tracker/internal/store"
+	"github.com/scottyah/fit/internal/config"
+	"github.com/scottyah/fit/internal/store"
 )
 
 // newServer builds a server whose "today" is fixed, so the day arithmetic is
@@ -22,7 +22,7 @@ func newServer(t *testing.T, today string) (*Server, *store.Store) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	st, err := store.Open(filepath.Join(t.TempDir(), "tracker.json"))
+	st, err := store.Open(filepath.Join(t.TempDir(), "fit.json"))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -240,11 +240,11 @@ func TestExportThenImport(t *testing.T) {
 	if rec.Code != http.StatusOK {
 		t.Fatalf("status %d", rec.Code)
 	}
-	if !strings.Contains(rec.Header().Get("Content-Disposition"), "tracker-2026-07-31.json") {
+	if !strings.Contains(rec.Header().Get("Content-Disposition"), "fit-2026-07-31.json") {
 		t.Errorf("download name = %q", rec.Header().Get("Content-Disposition"))
 	}
 
-	fresh, err := store.Open(filepath.Join(t.TempDir(), "tracker.json"))
+	fresh, err := store.Open(filepath.Join(t.TempDir(), "fit.json"))
 	if err != nil {
 		t.Fatal(err)
 	}