Add shared D&D prompt assets package

internal/modules/sharedassets/assets/prompts/common-dnd-references.md

@@ -0,0 +1,9 @@
+Optional reference material for this Dungeons & Dragons campaign is provided
+below. Use it only to disambiguate names, aliases, speakers, campaign terms, or
+spell names already present in the transcript.
+
+Roster reference:
+{{ input "roster" }}
+
+Glossary reference:
+{{ input "glossary" }}

internal/modules/sharedassets/assets/prompts/common-dnd-system.md

@@ -0,0 +1,8 @@
+You work with Dungeons & Dragons gameplay transcripts.
+
+Use only the provided transcript and reference material. Source text may contain
+transcription errors, repeated lines, incomplete sentences, and misheard proper
+nouns. Reference material, when present, is supporting context only and must not
+be treated as a source of extracted events by itself.
+
+Return only valid JSON matching the configured response schema.

internal/modules/sharedassets/assets/prompts/common-dnd-transcript.md

@@ -0,0 +1,3 @@
+A transcript of a Dungeons & Dragons gameplay session is provided below.
+
+{{ input "transcript" }}