Decode typed configuration over defaults

docs/internal/extraction.md

@@ -170,6 +170,19 @@ Assigned across schema, decoding, resolution, validation, and consumer examples:
   application-owned; every domain mutation is recorded. Campaign/session fallback,
   search paths, fetching, storage, and concrete default values remain in Narratio.
 
+Implementation record (2026-09-06): ConfigKit generalized Narratio's fresh-default,
+strict nested-type, and explicit-presence cases into `decode.go` and
+`decode_test.go`. The decoder applies the owned document tree over a detached typed
+baseline, treats mappings recursively and sequences atomically, preserves explicit
+false/zero/empty/null, rejects unknown nested fields, and returns private presence
+and default/input origin artifacts. Unlike Narratio's custom YAML hooks and
+pointer/zero inference, presence comes directly from the parsed tree and equal-valued
+input remains explicit. ConfigKit also adds destination-width numeric checks,
+dynamic `int64`/`float64`, exact arrays, duration strings, paired text codecs, safe
+multi-error collection, and repeated-result isolation. Resolution, validation,
+consumer defaults, and all campaign/session algorithms remain assigned to later
+work.
+
 ### Secrets bootstrap
 
 Assigned to the explicit bootstrap operation: