docs: add backlog item 999.2, SEO follow-ups after Phase 33 (v0.6.2)

.planning/ROADMAP.md

@@ -1844,3 +1844,21 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 →
 
 Plans:
 - [ ] TBD (promote with /gsd-review-backlog when ready)
+
+### Phase 999.2: SEO follow-ups after Phase 33, for v0.6.2 (BACKLOG)
+
+**Goal:** Clear what Phase 33 deferred:
+- the journal-tag drift warning while tag pages are off (G2), which needs an additive ContentDescriptor field such as `Routable` and signpost.Activate accepting a type without a URL pattern;
+- the deferred warnings and info items in 33-REVIEW.md and 33-REVIEW-GAPFIX.md, listed under "Deferred" in 33-15 and 33-16:
+  - sitemap: types sharing a group slug, no 50 MB byte guard, Additional addresses on another host;
+  - seo: long crawls held in memory and running past the job timeout, recheck inside an open transaction;
+  - journal layer: card image `sizes`, the sitemap group home crumb;
+  - journal plugin: the author login in URLs, the alt batch with locale "" next to the default locale, the settings API's own url check;
+- a post-release mode for `check-phase33.sh --consumers`;
+- the grzyby DEPLOY.md Verify line expecting `X-Robots-Tag: index, follow`;
+- a decision for untranslated locale addresses, which still serve default-locale content under their own canonical: point the canonical at the default locale, or answer 404.
+**Requirements:** TBD
+**Plans:** 0 plans
+
+Plans:
+- [ ] TBD (promote with /msd-review-backlog when ready)