Organize D&D extensions by domain

docs/internal/modules.md

@@ -1,7 +1,7 @@
 # Module And Validator Internals
 
-Production module implementations and generic validators live under
-`internal/modules`; the current D&D validators live under `internal/validators`.
+Production module and validator implementations live under their domain-first
+trees in `internal/modules`.
 The selectable keys, configuration options, reference slots, and default
 validator chain are canonical in the
 [module](../config.md#implemented-production-modules) and
@@ -26,10 +26,10 @@ that agreement. Runtime delivery uses the corresponding stage request's
 
 LLM-backed extensions own their prompt definitions and response schemas under
 package-local embedded assets. Shared filesystem composition belongs in
-`internal/modules/sharedassets`; reusable D&D prompt fragments, reference
+`internal/framework/promptfs`; reusable D&D prompt fragments, reference
 declarations, prompt-input assembly, and source-unit helpers belong in
-`internal/modules/sharedassets/dnd`. Stage contracts expose only Notarius
-structured-completion types, not Scriptorium public types.
+`internal/modules/dnd/shared`. Stage contracts expose only Notarius structured-
+completion types, not Scriptorium public types.
 
 Reference material may inform a module or prompt but must not become source
 evidence. The resolver and materializer behavior is described in
@@ -62,7 +62,7 @@ The accepted options and defaults are defined in
 [Configuration](../config.md#implemented-production-modules). Generic
 framework validation canonicalizes the returned unit slices before extraction.
 
-### `internal/modules/chunk/dnd/scenes`
+### `internal/modules/dnd/chunk/scenes`
 
 The scene chunker prepares a structured Scriptorium request from the full
 transcript, session, and optional D&D reference inputs. It validates the model's
@@ -82,7 +82,7 @@ file types remain canonical in [Configuration](../config.md).
 
 ## Extractor
 
-### `internal/modules/extract/dnd/spells`
+### `internal/modules/dnd/extract/spells`
 
 The spell extractor prepares a structured request from one chunk, the
 chunk-scoped source input, the session, and optional D&D reference inputs. It
@@ -141,7 +141,7 @@ from schema loading or compilation errors. Neither validator calls the LLM.
 
 ## D&D Spell Validators
 
-`internal/validators/extract/dnd/spells/spellpayload` provides strict decoding,
+`internal/modules/dnd/validate/spells/spellpayload` provides strict decoding,
 shape checks, source-reference candidates, and cited-text lookup shared by the
 three validators.
 
@@ -199,5 +199,7 @@ does not inventory implementations.
   defaults.
 - `internal/cli/run_test.go`: production catalog, config resolution, and
   end-to-end CLI composition.
-- `internal/modules/sharedassets/**/*_test.go`: shared prompt and reference
-  assembly.
+- `internal/framework/promptfs/*_test.go` and
+  `internal/modules/dnd/shared/*_test.go`: shared prompt and reference assembly.
+- `internal/modules/integration/*_test.go`: black-box composition across
+  production extension domains.