fix(captain-memory): strengthen RecallService logging context and document timeout tradeoff

enterprise/app/services/captain/contact_memories/recall_service.rb

@@ -12,21 +12,41 @@ class Captain::ContactMemories::RecallService
   def call
     return [] if @contact.blank? || @query_text.blank?
 
+    # NOTE: Timeout.timeout is used here as a hard cap on both embedding API + DB query.
+    # It has known hazards (async exception, can't cleanly interrupt C-level I/O, can
+    # corrupt connection state) — tradeoff accepted because this service is non-critical:
+    # any failure returns [] and the agent degrades gracefully without memory. Phase 6
+    # will consider refactoring the DB portion to Postgres statement_timeout for safer
+    # cancellation.
     Timeout.timeout(TIMEOUT_SECONDS) do
       query_embedding = Captain::Llm::EmbeddingService.new(account_id: @contact.account_id).get_embedding(@query_text)
       return [] if query_embedding.blank?
 
-      Captain::ContactMemory
-        .active
-        .for_contact(@contact.id)
-        .scope_compatible(@unit_id)
-        .where.not(embedding: nil)
-        .nearest_neighbors(:embedding, query_embedding, distance: 'cosine')
-        .limit(@top_k)
-        .to_a
+      nearest_memories(query_embedding)
     end
   rescue StandardError => e
-    Rails.logger.warn("[ContactMemory::RecallService] #{e.class}: #{e.message}")
+    log_failure(e)
     []
   end
+
+  private
+
+  def nearest_memories(query_embedding)
+    Captain::ContactMemory
+      .active
+      .for_contact(@contact.id)
+      .scope_compatible(@unit_id)
+      .where.not(embedding: nil)
+      .nearest_neighbors(:embedding, query_embedding, distance: 'cosine')
+      .limit(@top_k)
+      .to_a
+  end
+
+  def log_failure(error)
+    Rails.logger.warn(
+      "[ContactMemory::RecallService] #{error.class}: #{error.message} " \
+      "(contact_id=#{@contact&.id} account_id=#{@contact&.account_id})"
+    )
+    Rails.logger.warn(error.backtrace.first(5).join("\n")) unless error.is_a?(Timeout::Error)
+  end
 end

spec/enterprise/services/captain/contact_memories/recall_service_spec.rb

@@ -62,8 +62,9 @@ RSpec.describe Captain::ContactMemories::RecallService do
 
     it 'skips memories with NULL embedding' do
       create(:captain_contact_memory, contact: contact, account: account, embedding: nil)
+      valid = create(:captain_contact_memory, contact: contact, account: account, embedding: Array.new(1536, 0.1))
       result = described_class.new(contact: contact, query_text: 'x').call
-      expect(result).to eq([])
+      expect(result).to eq([valid])
     end
   end
 end