N5/D1b: boss epilogues + TwinBee's journal reactions

- Boss epilogues: a 2-3 sentence campaign capstone per zone boss, tying
  each kill to the Hollow King arc. Appended to the boss-down moment in
  both close-out paths (finishCombatSession solo, finishPartyWin party),
  gated on the boss room (!elite) so it fires for any boss kill —
  expedition or legacy !zone — and never for elites or the arena (which
  has no ZoneID entry). Forest of Shadows is the King himself; its
  epilogue frames the fall as a shed shell, leaving the arc for the finale.
- TwinBee digest reactions: a journal page found mid-expedition writes a
  "journal" log beat; the end-of-day digest emits one first-person,
  deterministically-picked TwinBee line reacting to the day's pages. No
  net-new DM — it rides the existing night-camp digest.

Golden byte-identical; go test ./... green.

Claude-Session: https://claude.ai/code/session_017mEwUmmS7aQTP2NQXj6rUa

internal/plugin/expedition_autorun_digest.go

@@ -44,11 +44,14 @@ func renderEndOfDayDigest(expID string, prevDay int) string {
 		threatLines   []string
 		milestoneLine []string
 		narrativeBits []string
+		journalPages  int
 	)
 	for _, e := range entries {
 		switch e.Type {
 		case "walk":
 			walks++
+		case "journal":
+			journalPages++
 		case "harvest":
 			// Only count successful gathers — failed rolls / errors are noise.
 			if strings.Contains(e.Summary, "success") {
@@ -115,6 +118,12 @@ func renderEndOfDayDigest(expID string, prevDay int) string {
 		b.WriteString("\n")
 		bulleted = true
 	}
+	if react := twinBeeJournalReaction(prevDay, journalPages); react != "" {
+		b.WriteString("• ")
+		b.WriteString(react)
+		b.WriteString("\n")
+		bulleted = true
+	}
 	if !bulleted {
 		// All entries were filtered out — fall back to the bare camp block.
 		return ""