Tighten historical roadmap wording

docs/modernization/roadmap.md

@@ -1509,9 +1509,10 @@ legacy-owned.
 The live PPBR import/export path consumes those helpers, while legacy
 Serializer/Image payload reading, stroke preview generation, preset storage,
 and the historical permissive version check remain tracked under `DEBT-0047`
-and `DEBT-0049`. The compatibility test fixture now spells out the tolerated
-legacy matrix more directly, but the parser still keeps the permissive rule
-until a stricter supported-version policy is proven safe.
+and `DEBT-0049`. The compatibility fixture now spells out the observed legacy
+cases more directly (`0.0`, `0.1`, `0.2`, `1.1`, `2.1`, rejected `1.2`), but
+the parser still keeps the permissive rule until a stricter supported-version
+policy is proven safe.
 ABR and PPBR import image target planning for brush tips and patterns also now
 uses `pp_assets::brush_package`, so the legacy preset panel no longer owns the
 `data/brushes`, `data/brushes/thumbs`, `data/patterns`, and
@@ -3235,8 +3236,8 @@ Results:
   the legacy OpenGL blend draw.
 - `STR-016` completed on 2026-06-13 in `b9ed78e1`; the per-layer composite
   block moved out of `Canvas::draw_merge()`, and the follow-on
-  `draw_checkerboard`/helper-shape cleanup now reads as historical `DEBT-0036`
-  reduction rather than a live blocker on the task tracker.
+  `draw_checkerboard`/helper-shape cleanup is historical `DEBT-0036`
+  reduction.
 - `Canvas::draw_merge_branch_orchestration()` and
   `Canvas::draw_merge_temporary_paint_branch()` later kept narrowing
   `DEBT-0036`, but the draw-merge extraction itself is no longer blocked by