Collapse the duplicate away-detail and panic tests

Two agents wrote the same three test helpers and names for the same two
bugs. Kept the real assertions from dispatcher_test.go and removed the
skipped placeholders they replace. panicSink stays in durability_test.go
since both files use it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ

internal/delivery/routing_table_test.go

@@ -2,7 +2,6 @@ package delivery
 
 import (
 	"context"
-	"strings"
 	"testing"
 	"time"
 
@@ -200,47 +199,11 @@ func TestAwayChannelsGetMinimalBody(t *testing.T) {
 	}
 }
 
-// TestSev4AwaySendableCarriesNoDetail — DESIGN.md § Delivery: away channels
-// leave the box, so a sev4-away message must not carry detail beyond the short
-// form. Today the dispatcher hands the away sink the FULL Body as well as the
-// Summary (dispatcher.go:153-162 copies pn.Body into every Sendable) and
-// trusts each sink to pick Summary. That works for the two sinks in-tree, but
-// the minimal body is not enforced at the dispatcher, so a new away sink that
-// reads Body exfils by default.
-func TestSev4AwaySendableCarriesNoDetail(t *testing.T) {
-	t.Skip("not enforced: dispatcher.go:159 puts the full Body on away sendables; minimal body is only enforced per-sink (ntfysink.go:77, telegramsink.go:148)")
-
-	telegram := &fakeSink{}
-	d := NewDispatcher(Config{Telegram: telegram, Ack: newFakeAck()})
-	detail := "disk /mnt/hdd1 at 97%, biggest offender /var/lib/docker"
-
-	if _, err := d.DispatchNudge(context.Background(), PhrasedNudge{
-		Candidate: candidate("disk_low", loop.Sev4, store.Away),
-		Body:      detail, Summary: "disk low on homesrv",
-	}, refNow()); err != nil {
-		t.Fatalf("dispatch: %v", err)
-	}
-	if strings.Contains(telegram.sends[0].Body, "/var/lib/docker") {
-		t.Fatalf("away sendable carries detail: %q", telegram.sends[0].Body)
-	}
-}
-
-// TestAwayFallsBackToFullBodyWhenSummaryEmpty — the other half of the same
-// gap: with no Summary, the full body leaves the box. The code chooses that on
-// purpose ("a terse full message is better than no message",
-// dispatcher.go:345-357), which contradicts the spec's minimal-body rule.
-// Written to the spec, skipped because the code disagrees.
-func TestAwayFallsBackToFullBodyWhenSummaryEmpty(t *testing.T) {
-	t.Skip("by design today: dispatcher.go:356 and ntfysink.go:79 fall back to the full Body when Summary is empty, so detail can leave the box")
-
-	msg := messageForChannel(Sendable{
-		Channel: ChannelNtfy,
-		Body:    "internal detail that should never leave the box",
-	})
-	if msg != "" {
-		t.Fatalf("empty summary must not fall back to body, got %q", msg)
-	}
-}
+// Both away-detail gaps this file used to describe as skipped tests are now
+// fixed and asserted for real in dispatcher_test.go:
+// TestSev4AwaySendableCarriesNoDetail and TestAwaySendsGenericLineWhenSummaryEmpty.
+// An empty Summary no longer means "send the whole body" — it means a short
+// generic line — so the old expectation here was wrong as well as duplicated.
 
 // TestCareAwayDropIsRecorded — DESIGN.md's drop is a decision ("a missed water
 // nudge is noise, a missed backup failure isn't"), so it should be visible