chore(docs): fix broken anchor and core-concepts link

The rebase reintroduced a link to a renamed anchor in scopes.mdx, and
unified-memory-setup pointed at /core-concepts/, which has no index page.

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

docs/v3/documentation/features/advanced/scopes.mdx

@@ -92,7 +92,7 @@ answer = user.chat("What did they say?", scope=["therapy", "intake"])
 
 Reach for this when the set of sessions is decided per-request, or when you want
 a quick boundary without provisioning a scope. See
-[Restricting Recall to Sessions](/v3/documentation/features/advanced/using-filters#restricting-recall-to-sessions)
+[Scoping Recall to Sessions](/v3/documentation/features/advanced/using-filters#scoping-recall-to-sessions)
 for the full allowlist rules.
 
 <Info>

docs/v3/guides/recipes/unified-memory-setup.mdx

@@ -6,7 +6,7 @@ description: "Wire one shared Honcho workspace across a chat companion, a coding
 ---
 <Info>
 This is a how-to, not an intro. It assumes you know what workspaces, peers, and
-sessions are. If you don't, start with [Core Concepts](/v3/documentation/core-concepts/).
+sessions are. If you don't, start with [Core Concepts](/v3/documentation/core-concepts/architecture).
 </Info>
 
 This guide wires four integration points into a single Honcho setup: a