Add example profiles, schemas, and an end-to-end local fixture

profiles/dnd.session_recap.yaml

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+id: dnd.session_recap
+version: "1.0.0"
+description: Example D&D session recap profile for demonstration only.
+expected_inputs:
+  - transcript
+  - glossary
+templates:
+  - role: system
+    content: |
+      You create concise tabletop RPG session recaps.
+      Stay factual and avoid inventing events.
+  - role: user
+    content: |
+      Produce a recap with these sections:
+      - Session Highlights
+      - Open Threads
+      - NPC Mentions
+
+      Transcript:
+      {{input "transcript"}}
+
+      Glossary:
+      {{input "glossary"}}
+model_defaults:
+  endpoint: http://localhost:8000/v1
+  model: gpt-4o-mini
+  temperature: 0.3
+  max_tokens: 900
+output_format: markdown
+validation:
+  validation_mode: basic