docs(adr): mark ADR-0094 D2's env-overlay cross-reference as retired, pointing at D5-R (#7351)

D2 restated D5's 2026-07-14 direction as a live parenthetical — "see D5 — an env
overlay is the standard customization of a packaged set" — with no retirement
marker, in a section a reader reaches before D5 itself. D5's own heading has said
"RETIRED 2026-08-09 — see D5-R" since #6858 / PR #6962, so the document
contradicted itself in one file.

The pointer now names D5-R, marks the direction retired, and states what follows
for the projector: an artifact-backed set normally has no overlay layer left to
contribute to the effective body. This follows the idiom D3's table row already
uses ("Since D5-R this row describes a path that is normally empty").

D5's preserved body and the surrounding historical record are untouched — the
retirement is deliberately recorded as history, not rewritten.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016pY4Xb2iDecfDtT3CWoiTW

Author: claude

docs/adr/0094-sys-permission-set-pure-projection.md

@@ -106,7 +106,9 @@ effective body** and:
 - upserts the record (creates it if missing, `managed_by:'user'` — Studio-created
   sets now appear in Setup); a PACKAGE-OWNED record's facets follow the effective
   body too, with its `managed_by:'package'` + `package_id` provenance preserved
-  (see D5 — an env overlay is the standard customization of a packaged set);
+  (see D5-R — **D5's "an env overlay is the standard customization of a packaged
+  set" direction is RETIRED as of 2026-08-09**, so for an artifact-backed set there
+  is normally no overlay layer left to contribute to that effective body);
 - syncs the **metadata manager's in-memory `permission` entry**
   (`registerInMemory`) so the evaluator's registry-first `list('permission')`
   resolution sees the same effective body it projects — closing the