rss: provenance + score calibration in items

Item titles gain a rune-capped source-feed suffix so list views (which
only ever show the channel title) display provenance inline. Item bodies
open with feed, model score, and the batch-wide score median; the median
is computed over every scored entry at poll time and stored on the run
row as a nil-safe pointer, so old rows render without it. /api/status
exposes the median too.

1 files changed, 17 insertions, 0 deletions

diff --git a/cmds/serve_test.go b/cmds/serve_test.go
index d7df2dd..e8aec19 100644
--- a/cmds/serve_test.go
+++ b/cmds/serve_test.go
@@ -133,6 +133,9 @@ func TestPollMultiPage(t *testing.T) {
 	if !row.ModelCreatedAt.Equal(model.CreatedAt) {
 		t.Errorf("model_created_at = %v, want %v", row.ModelCreatedAt, model.CreatedAt)
 	}
+	if row.ScoreMedian == nil {
+		t.Error("score_median missing on run row (median over all scored entries)")
+	}
 }
 
 func TestPollCrashLeavesNoState(t *testing.T) {
@@ -274,6 +277,20 @@ func TestAssembleBatchFewCandidates(t *testing.T) {
 	}
 }
 
+func TestMedianScore(t *testing.T) {
+	if m := medianScore(nil); m != nil {
+		t.Errorf("empty poll: median = %v, want nil (field omitted)", *m)
+	}
+	odd := []scoredEntry{{score: 0.1}, {score: 0.9}, {score: 0.5}}
+	if m := medianScore(odd); m == nil || *m != 0.5 {
+		t.Errorf("odd median = %v, want 0.5", m)
+	}
+	even := []scoredEntry{{score: 0.1}, {score: 0.5}, {score: 0.9}, {score: 0.2}}
+	if m := medianScore(even); m == nil || *m != 0.35 {
+		t.Errorf("even median = %v, want 0.35", m)
+	}
+}
+
 func TestParseRefreshAt(t *testing.T) {
 	mins, err := parseRefreshAt("18:00,06:00, 12:30")
 	if err != nil {