refactor(core): drop the empty goals module

Every part of the goals domain — the RPC surface, the reflection agent, the
agent tools — names host types, and its store lives in tinycortex. What was
left here re-exported nothing, so `memory::goals` in the host was importing an
empty module. Removed rather than kept as a husk.

Co-authored-by: Medulla <medulla@tinyhumans.ai>

Author: enamakel

core/src/goals/mod.rs

@@ -41,7 +41,6 @@ pub mod embedding_adapter;
 pub mod embedding_host;
 pub mod events;
 pub mod global;
-pub mod goals;
 pub mod ingest_pipeline;
 pub mod ingestion;
 pub mod learning_candidate;