Add normalize configuration contract

architecture.md

@@ -98,6 +98,21 @@ Adapter behavior:
 
 `pipeline.trim` is optional. Existing pipelines without trim config continue to work.
 
+`pipeline.normalize` is optional. Existing pipelines without normalize config continue to work.
+
+When `pipeline.normalize` is omitted, defaults are applied:
+
+- `output_path: transcripts/normalized.json`
+- `output_schema: seriatim-intermediate`
+- `report: true`
+
+When `pipeline.normalize` is present:
+
+- `output_path` must be non-empty
+- `output_schema` must be one of `seriatim-minimal`, `seriatim-intermediate`, or `seriatim-full`
+- relative `output_path` values are session-workdir-relative paths
+- Seriatim binary settings still come from `pipeline.seriatim`
+
 When `pipeline.trim` is present:
 
 - `enabled` is optional and defaults to `false` when omitted