fix: floor token budgets and surface truncation, add live progress

Reasoning models burn thousands of completion tokens before the
answer. Small per-test caps caused silent truncation and zero scores.
The runner now floors max_tokens at the config default (12000). The
client parses finish_reason. Reports mark truncated cells and the
JSON format carries response text for debugging. A stderr progress
reporter prints one line per completed request; --quiet disables it.

internal/report/table.go

@@ -51,14 +51,19 @@ func writeScoreTable(ew *errWriter, tests []testkit.Test, models []string, idx r
 	header = append(header, models...)
 	ew.println(strings.Join(header, "\t"))
 
+	anyTruncated := false
 	for _, t := range sortedTests(tests) {
 		row := []string{t.ID, t.Category, t.Subcategory}
 		for _, model := range models {
 			r, ok := idx[t.ID][model]
 			row = append(row, cellText(r, ok))
+			anyTruncated = anyTruncated || r.Truncated()
 		}
 		ew.println(strings.Join(row, "\t"))
 	}
+	if anyTruncated {
+		ew.println(truncatedLegend)
+	}
 }
 
 func writeCategoryTable(ew *errWriter, tests []testkit.Test, models []string, idx resultIndex) {