feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

internal/ai/rag/retrieve.go

@@ -1,3 +1,4 @@
+// Modified in the independent AgentDesk fork: localized knowledge workflows and safe display errors.
 package rag
 
 import (
@@ -32,6 +33,9 @@ type RetrieveTrace struct {
 
 func (s *retrieve) RetrieveWithTrace(ctx context.Context, req RetrieveRequest) ([]RetrieveResult, *RetrieveTrace, error) {
 	trace := newRetrieveTrace()
+	if err := ctx.Err(); err != nil {
+		return nil, trace, err
+	}
 	retrievableKnowledgeBases, _, ok := s.prepareRetrievableKnowledgeBases(req, trace)
 	if !ok {
 		return nil, trace, nil
@@ -47,7 +51,7 @@ func (s *retrieve) RetrieveWithTrace(ctx context.Context, req RetrieveRequest) (
 	if len(searchResults) == 0 {
 		return nil, trace, nil
 	}
-	results, hydrateMs := s.hydrateRetrieveResults(searchResults)
+	results, hydrateMs := s.hydrateRetrieveResults(ctx, searchResults)
 	trace.HydrateMs = hydrateMs
 
 	return results, trace, nil