Implement CE-WP-0009: wire umbrella to @citation-evidence/engine

Add link: dependency on citation-engine, retarget @shared/@engine aliases,
remove in-repo shared/engine copies. ADR-0002 accepted (option B).
172 tests, typecheck, and lint pass.

workplans/CE-WP-0009-engine-workspace-wireup.md

@@ -7,7 +7,7 @@ repo: citation-evidence
 repo_id: a677c189-b4e2-4f2a-9e48-faa482c277e6
 topic_slug: citation_evidence_mvp
 topic_id: 96fa8e80-9f74-40f2-84cd-644e9747b9ec
-status: active
+status: done
 owner: codex
 created: "2026-06-22"
 updated: "2026-06-22"
@@ -51,7 +51,7 @@ T01 (add package dependency + resolve aliases)
 
 ```task
 id: CE-WP-0009-T01
-status: wait
+status: done
 priority: critical
 depends_on: []
 ```
@@ -77,7 +77,7 @@ next to umbrella, same layout as today).
 
 ```task
 id: CE-WP-0009-T02
-status: wait
+status: done
 priority: critical
 depends_on: [T01]
 ```
@@ -103,7 +103,7 @@ Do **not** change import statements in `anchor/`, `source/`, `binder/`,
 
 ```task
 id: CE-WP-0009-T03
-status: wait
+status: done
 priority: critical
 depends_on: [T02]
 ```
@@ -125,7 +125,7 @@ Update partition README pointers in remaining `src/*/` folders to reference
 
 ```task
 id: CE-WP-0009-T04
-status: wait
+status: done
 priority: critical
 depends_on: [T03]
 ```