Step 7: Add remove command to stop tracking files.

Implements Garden.Remove() which unregisters paths from the manifest,
plus unit tests and the CLI wiring via cobra.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

garden/remove.go

@@ -0,0 +1,38 @@
+package garden
+
+import (
+	"fmt"
+	"path/filepath"
+)
+
+// Remove stops tracking the given paths. Each path is resolved to absolute
+// form, converted to a tilde path, and removed from the manifest. An error
+// is returned if any path is not currently tracked.
+func (g *Garden) Remove(paths []string) error {
+	for _, p := range paths {
+		abs, err := filepath.Abs(p)
+		if err != nil {
+			return fmt.Errorf("resolving path %s: %w", p, err)
+		}
+
+		tilded := toTildePath(abs)
+
+		if g.findEntry(tilded) == nil {
+			return fmt.Errorf("not tracking %s", tilded)
+		}
+
+		filtered := g.manifest.Files[:0]
+		for _, e := range g.manifest.Files {
+			if e.Path != tilded {
+				filtered = append(filtered, e)
+			}
+		}
+		g.manifest.Files = filtered
+	}
+
+	if err := g.manifest.Save(g.manifestPath); err != nil {
+		return fmt.Errorf("saving manifest: %w", err)
+	}
+
+	return nil
+}

garden/remove_test.go

@@ -0,0 +1,65 @@
+package garden
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestRemoveTrackedFile(t *testing.T) {
+	root := t.TempDir()
+	repoDir := filepath.Join(root, "repo")
+
+	g, err := Init(repoDir)
+	if err != nil {
+		t.Fatalf("Init: %v", err)
+	}
+
+	// Create and add a file.
+	testFile := filepath.Join(root, "testfile")
+	if err := os.WriteFile(testFile, []byte("hello\n"), 0o644); err != nil {
+		t.Fatalf("writing test file: %v", err)
+	}
+
+	if err := g.Add([]string{testFile}); err != nil {
+		t.Fatalf("Add: %v", err)
+	}
+
+	if len(g.manifest.Files) != 1 {
+		t.Fatalf("expected 1 file after add, got %d", len(g.manifest.Files))
+	}
+
+	// Remove it.
+	if err := g.Remove([]string{testFile}); err != nil {
+		t.Fatalf("Remove: %v", err)
+	}
+
+	if len(g.manifest.Files) != 0 {
+		t.Errorf("expected 0 files after remove, got %d", len(g.manifest.Files))
+	}
+
+	// Verify the manifest was persisted.
+	g2, err := Open(repoDir)
+	if err != nil {
+		t.Fatalf("re-Open: %v", err)
+	}
+	if len(g2.manifest.Files) != 0 {
+		t.Errorf("persisted manifest has %d files, want 0", len(g2.manifest.Files))
+	}
+}
+
+func TestRemoveUntrackedPathErrors(t *testing.T) {
+	root := t.TempDir()
+	repoDir := filepath.Join(root, "repo")
+
+	g, err := Init(repoDir)
+	if err != nil {
+		t.Fatalf("Init: %v", err)
+	}
+
+	// Try removing a path that was never added.
+	bogus := filepath.Join(root, "nonexistent")
+	if err := g.Remove([]string{bogus}); err == nil {
+		t.Fatal("Remove of untracked path should return an error")
+	}
+}