Clarify filesystem directive and override ownership

docs/internal/overview.md

@@ -19,8 +19,9 @@ module and package documentation boundary. Its implemented public primitives are
 - fixed selected-profile loading in `profile.go` and recursive, non-aliasing overlay
   with displacement records in `overlay.go`; overlay records retain origins,
   while value explanation uses separate history applications;
-- detached parser-neutral CLI override validation and synthetic-source application
-  in `override.go`, sharing overlay, source, byte, node, and depth policies;
+- CLI override validation/preparation in `override.go`, parser-neutral values in
+  `override_value.go`, and synthetic-source application in `override_apply.go`,
+  sharing overlay, source, byte, node, and depth policies;
 - a per-operation private reflection descriptor graph in `schema.go` for supported
   types, YAML field binding, inlining, secret tags, recursion, and semantic paths;
 - descriptor-driven canonical projection in `projection.go`, detached typed
@@ -31,7 +32,9 @@ module and package documentation boundary. Its implemented public primitives are
   mapping/sequence semantics, null and numeric policy, safe codec errors, presence,
   baseline/final trees, and initial default/input origins;
 - public lifecycle coordination in `load.go`, bounded canonical import DFS in
-  `imports.go`, pattern-directed glob expansion in `glob.go`, version-report contexts
+  `imports.go`, filesystem context/containment in `filesystem.go`, directive
+  parsing/restrictions in `directives.go`, pattern-directed glob expansion in
+  `glob.go`, version-report contexts
   in `validation.go`, and detached layered metadata/history assembly in
   `load_metadata.go`;
 - recorded application defaulting and normalization in `resolution.go`, including