Route direct-stdout command output through internal/ui (closes #149)

version, info, remote info, config, and database delete wrote plain text straight to stdout, so they were unstyled and ignored --quiet. Output is now governed by internal/ui in two buckets. Status lines and confirmations (config init, config set, the database delete prompt) go through the ui message methods and are silenced by --quiet. The data a command exists to produce is written plain -- the version/info/remote-info reports, the snapshot list table, config get values, and the --json documents -- and is never suppressed, since a script depends on it and a marker would corrupt a table or document. The database delete confirmation prompt is always shown. Pure-cli commands reach ui through a small commandUI helper.

Model: opus-4-8

internal/vaultik/snapshot_list_quiet_test.go

@@ -0,0 +1,41 @@
+package vaultik_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"sneak.berlin/go/vaultik/internal/log"
+)
+
+// TestListSnapshots_QuietSuppressesTableNotJSON is the --quiet contract
+// for `snapshot list`: the human table is silenced, but the --json
+// document a script depends on still emits. A local snapshot with its
+// remote counterpart present is used so there are no drift notes, whose
+// warnings would emit even under --quiet.
+func TestListSnapshots_QuietSuppressesTableNotJSON(t *testing.T) {
+	log.Initialize(log.Config{})
+	t.Parallel()
+
+	env := newListEnv(t)
+
+	ts := time.Date(2026, 3, 1, 10, 0, 0, 0, time.UTC)
+	env.addLocal(t, listLocalID, ts)
+	env.addRemote(t, listLocalID, ts)
+
+	env.v.UI.SetQuiet(true)
+
+	// Table mode: nothing on stdout.
+	require.NoError(t, env.v.ListSnapshots(false))
+	require.Empty(t, env.stdout.String(),
+		"the table must be suppressed under --quiet")
+
+	// JSON mode: the document is still written despite the quiet UI.
+	env.stdout.Reset()
+	require.NoError(t, env.v.ListSnapshots(true))
+
+	rows := decodeListJSON(t, env.stdout.String())
+	require.Len(t, rows, 1)
+	require.Equal(t, listLocalID, rows[0].ID,
+		"the --json document must still emit under --quiet")
+}