fix: resolve CI failures — lint errors, pytz in redis, lockfile mismatch

- Remove unused imports: get_update_memory_messages, get_fact_retrieval_messages
- Fix pytz.timezone("US/Pacific") → timezone.utc in redis vector store
- Remove unused entity_types variable in test_entity_extraction
- Regenerate pnpm-lock.yaml after neo4j-driver removal

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mem0/memory/main.py

@@ -20,7 +20,6 @@ from mem0.configs.prompts import (
     AGENT_CONTEXT_SUFFIX,
     generate_additive_extraction_prompt,
     PROCEDURAL_MEMORY_SYSTEM_PROMPT,
-    get_update_memory_messages,
 )
 from mem0.utils.lemmatization import lemmatize_for_bm25
 from mem0.utils.entity_extraction import extract_entities, extract_entities_batch
@@ -32,7 +31,6 @@ from mem0.memory.storage import SQLiteManager
 from mem0.memory.telemetry import MEM0_TELEMETRY, capture_event
 from mem0.memory.utils import (
     extract_json,
-    get_fact_retrieval_messages,
     parse_messages,
     parse_vision_messages,
     process_telemetry_filters,

mem0/vector_stores/redis.py

@@ -217,12 +217,12 @@ class RedisDB(VectorStoreBase):
                     "hash": result["hash"],
                     "data": result["memory"],
                     "created_at": datetime.fromtimestamp(
-                        int(result["created_at"]), tz=pytz.timezone("US/Pacific")
+                        int(result["created_at"]), tz=timezone.utc
                     ).isoformat(timespec="microseconds"),
                     **(
                         {
                             "updated_at": datetime.fromtimestamp(
-                                int(result["updated_at"]), tz=pytz.timezone("US/Pacific")
+                                int(result["updated_at"]), tz=timezone.utc
                             ).isoformat(timespec="microseconds")
                         }
                         if "updated_at" in result