feat(views): wire derived views onto InformationSpace + integration (WP-0010 T5)

Expose backlinks(name), recent_changes(), all_pages(), site_map() on
InformationSpace. Integration test exercises all four over two shards (BackLinks
aggregate across shards, AllPages/SiteMap span the union, RecentChanges merges an
alias decision with shard edits). SCOPE updated; WP-0010 done. 152 tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

workplans/SHARD-WP-0010-derived-views.md

@@ -4,7 +4,7 @@ type: workplan
 title: "derived views — wikilinks, BackLinks, RecentChanges, AllPages/SiteMap"
 domain: whynot
 repo: shard-wiki
-status: active
+status: done
 owner: tegwick
 topic_slug: whynot
 created: "2026-06-15"
@@ -36,7 +36,7 @@ later by SHARD-WP-0011) and carry provenance. Presentation stays out of core (L6
 
 ```task
 id: SHARD-WP-0010-T1
-status: todo
+status: done
 priority: high
 state_hub_task_id: "792660c3-9be9-4771-9f51-69d01f0c7f13"
 ```
@@ -51,7 +51,7 @@ red-link, CamelCase opt-in.
 
 ```task
 id: SHARD-WP-0010-T2
-status: todo
+status: done
 priority: high
 state_hub_task_id: "431a54c3-82b5-4b08-b3f0-762624d4c91d"
 ```
@@ -65,7 +65,7 @@ chorus pages aggregate.
 
 ```task
 id: SHARD-WP-0010-T3
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "270c1c31-0445-42b9-9a49-92d32c298eb2"
 ```
@@ -79,7 +79,7 @@ alias both appear, newest-first; per-shard attribution present.
 
 ```task
 id: SHARD-WP-0010-T4
-status: todo
+status: done
 priority: low
 state_hub_task_id: "898ba43e-cdef-4ce8-9fa3-4ce60ebb4fdd"
 ```
@@ -92,7 +92,7 @@ collapses to one entry with divergence noted; sitemap reflects paths.
 
 ```task
 id: SHARD-WP-0010-T5
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "7157544b-5d3b-45a2-ba5a-c32244c59323"
 ```