Phase 0 close-out: link README status block to DokuWiki closing remarks

Campaign closed 2026-05-03 with negative result on both axes
(X11+xfwm4-no-comp measurably worse than Plasma Wayland for
chromium-fourier on the test page; no client/path on this stack
engages hardware-overlay scanout for NV12). Full closing remarks
+ next-move options live at
dokuwiki.reauktion.de/doku.php?id=x11_session_research:start.

README left as the on-the-day framing for context; the new
status block points to the DokuWiki page as the
campaign-closure record. The Phase 0 evidence under
phase0_evidence/ is the source-of-truth substrate behind that
page.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -1,12 +1,14 @@
 # x11-session-research
 
-> **Status: PHASE 0 — motivation locked 2026-05-03.**
+> **Status: CLOSED 2026-05-03 with negative result on both
-> See [`phase0_findings.md`](phase0_findings.md) §
+> campaign axes.** Closing remarks (research question,
-> "Research question (LOCKED 2026-05-03)". Phase 1 still
+> outcome, methodological corrigendum, three legitimate
-> requires the four pre-question Phase 0 deliverables
+> next moves a follow-up could pick up):
-> (state snapshot, X11 path inventory, browser-overlay-path
+> <https://dokuwiki.reauktion.de/doku.php?id=x11_session_research:start>.
-> inventory, **own** baseline anchor) before binding cells
+> The Phase 0 evidence under `phase0_evidence/` and the
-> lock.
+> Phase 0 findings doc are the source-of-truth substrate
+> behind that page; this README left as the on-the-day
+> framing of what the campaign expected to find.
 
 **Research question:** Does cutting out the KWin compositor
 enable faster video display of Brave, chromium-fourier, and