docs: fix stale WP-65 status in backlog README, closing the format:check gap

WP-65's summary-table row still said "in progress (65a done)" from before
65b shipped, and that one oversized cell was forcing prettier to want to
re-pad the entire ~65-row table. Correcting it to "done" (its actual
status, per the WP-65 file's own outcome notes) removes the outlier —
npm run format:check is green again with zero other rows touched.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/project/backlog/README.md

@@ -115,7 +115,7 @@ for its existing violations, so every WP ends green.
 | [WP-62](WP-62-medewerker-identity-authz.md)            | Backend: medewerker caller identity + authz seam                                   | 11 · Behandelportal         | done   |
 | [WP-63](WP-63-aanvraag-status-lifecycle.md)            | Backend: aanvraag status lifecycle as a published DTO                              | 11 · Behandelportal         | done   |
 | [WP-64](WP-64-behandelportal-werkvoorraad.md)          | Behandelportal: werkvoorraad (queue) screen                                        | 11 · Behandelportal         | done   |
-| [WP-65](WP-65-behandelportal-beoordeling.md)           | Behandelportal: zaak detail + beoordeling (decision) screen                        | 11 · Behandelportal         | in progress (65a done) |
+| [WP-65](WP-65-behandelportal-beoordeling.md)           | Behandelportal: zaak detail + beoordeling (decision) screen                        | 11 · Behandelportal         | done   |
 | [WP-66](WP-66-behandelportal-openzaak-write.md)        | Wire the decision into OpenZaak                                                    | 11 · Behandelportal         | todo   |
 | [WP-67](WP-67-monorepo-behandelportal.md)              | Merge behandelportal into this repo as a monorepo                                  | 11 · Behandelportal         | done   |