Post-v0.5.0 docs: Pages markdown fix, credit line, release-notes template, ROADMAP/D572

- Pages: the two cblock sections render as markdown under GitHub Pages'
  kramdown (markdown="1"); the Download block's unparsed `<file>` had swallowed
  every heading below it. Gallery alt text says 3840x2160.
- Credit line (README "How it was made" + social preview card): several coding
  agents directed by one maintainer, with a handful of contributors; card
  findings count 430.
- Release-notes template: drop the stale header-stills comment and the Aztec
  re-check-owed note.
- ROADMAP: Windows display-scaling (not DPI-aware) item
  D572: CI-tarball verification (glibc floor, X220 + Deck fresh
  install, 21/21 pixel gate on both).

docs/index.md

@@ -30,7 +30,7 @@ Rare "Indy" engine family, one hardware generation apart.
 
 ## Status
 
-<div class="cblock">
+<div class="cblock" markdown="1">
 
 ### v0.5.0 (2026-10-07) — split-screen multiplayer, one options menu, closer to the N64.
 
@@ -98,7 +98,7 @@ single tracker for what comes next.
 
 ## Download
 
-<div class="cblock">
+<div class="cblock" markdown="1">
 
 | Platform | Bundle | Notes |
 |---|---|---|
@@ -214,7 +214,7 @@ architecture, the N64→PC bug catalogue, and how the project is developed.
       i = (n + slides.length) % slides.length;
       img.src = slides[i].src;
       img.alt = "GoldenEye 007 PC port — " + slides[i].cap +
-                ", in-engine capture, 3072×1728";
+                ", in-engine capture, 3840×2160";
       cap.textContent = slides[i].cap;
       idx.textContent = (i + 1) + " / " + slides.length;
     }