feat(cli): upgrade command, rich status, and version cache

- Replace `upgrade` stub with real command (alias for `self-update`)
- Also register `update` as alias: `unarr update` works too
- Rewrite `status` to show full config, disk usage, daemon state, and
  update availability with colored sections
- Add version check cache (1h TTL) so `status` is instant on repeat runs
- Guard against division by zero on empty filesystems
- Guard against negative durations from clock skew
- Guard against stale PID via heartbeat recency check (2 min)
- Add comprehensive test coverage across agent, engine, upgrade, usenet,
  arr, library, mediaserver, and UI packages
- Improve Makefile coverage target to exclude cmd/ glue code
- Fix stream handler resource cleanup and ffprobe error handling

internal/ui/table_test.go

@@ -0,0 +1,122 @@
+package ui
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	tc "github.com/torrentclaw/go-client"
+)
+
+func TestNewCleanTable(t *testing.T) {
+	var buf bytes.Buffer
+	tbl := newCleanTable(&buf)
+	tbl.Header([]string{"A", "B"})
+	tbl.Append([]string{"1", "2"})
+	tbl.Render()
+
+	out := buf.String()
+	if !strings.Contains(out, "A") || !strings.Contains(out, "B") {
+		t.Errorf("expected headers in output, got: %s", out)
+	}
+	if !strings.Contains(out, "1") || !strings.Contains(out, "2") {
+		t.Errorf("expected row data in output, got: %s", out)
+	}
+}
+
+func TestPrintSearchResultEntry(t *testing.T) {
+	var buf bytes.Buffer
+	year := 2010
+	rating := "8.8"
+	quality := "1080p"
+	codec := "x265"
+	size := int64(4294967296)
+	score := 85
+
+	r := tc.SearchResult{
+		Title:       "Inception",
+		Year:        &year,
+		ContentType: "movie",
+		RatingIMDb:  &rating,
+		Genres:      []string{"Sci-Fi", "Action"},
+		Torrents: []tc.TorrentInfo{
+			{
+				Quality:      &quality,
+				SizeBytes:    &size,
+				Seeders:      150,
+				Leechers:     10,
+				Source:       "YTS",
+				Codec:        &codec,
+				Languages:    []string{"en", "es"},
+				QualityScore: &score,
+			},
+		},
+	}
+
+	printSearchResultEntry(&buf, r)
+	out := buf.String()
+
+	if !strings.Contains(out, "Inception") {
+		t.Error("expected title in output")
+	}
+	if !strings.Contains(out, "2010") {
+		t.Error("expected year in output")
+	}
+	if !strings.Contains(out, "8.8") {
+		t.Error("expected rating in output")
+	}
+	if !strings.Contains(out, "1080p") {
+		t.Error("expected quality in output")
+	}
+	if !strings.Contains(out, "YTS") {
+		t.Error("expected source in output")
+	}
+}
+
+func TestPrintSearchResultEntryNoTorrents(t *testing.T) {
+	var buf bytes.Buffer
+	year := 2020
+
+	r := tc.SearchResult{
+		Title:       "No Torrents Movie",
+		Year:        &year,
+		ContentType: "movie",
+		Torrents:    nil,
+	}
+
+	printSearchResultEntry(&buf, r)
+	out := buf.String()
+
+	if !strings.Contains(out, "No Torrents Movie") {
+		t.Error("expected title in output")
+	}
+	if !strings.Contains(out, "No torrents available") {
+		t.Error("expected no-torrents message")
+	}
+}
+
+func TestPrintSearchResultEntryNilFields(t *testing.T) {
+	var buf bytes.Buffer
+
+	r := tc.SearchResult{
+		Title:       "Minimal",
+		ContentType: "movie",
+		Torrents: []tc.TorrentInfo{
+			{
+				Seeders:  5,
+				Leechers: 3,
+				Source:   "RARBG",
+			},
+		},
+	}
+
+	printSearchResultEntry(&buf, r)
+	out := buf.String()
+
+	if !strings.Contains(out, "Minimal") {
+		t.Error("expected title in output")
+	}
+	if !strings.Contains(out, "-") {
+		t.Error("expected dash for nil fields")
+	}
+}