[BUG] compute_composite_score crashes with TypeError on timezone-aware datetimes during memory recall

Description

In lib/crewai/src/crewai/memory/types.py (line 364), compute_composite_score() calculates the age of a record as:

age_seconds = (datetime.utcnow() - record.created_at).total_seconds()

datetime.utcnow() produces an offset-naive datetime (and is deprecated since Python 3.12).

If a MemoryRecord has a timezone-aware created_at timestamp (such as datetime.now(timezone.utc), timestamps loaded from external stores/APIs with UTC offsets like +00:00 or Z), subtracting them raises:

TypeError: can't subtract offset-naive and offset-aware datetimes
Because compute_composite_score() is called during every memory.recall() in unified_memory.py and RecallFlow in recall_flow.py, any memory record created with a timezone-aware datetime immediately crashes the agent's recall pipeline.

Steps to Reproduce

from datetime import datetime, timezone
from crewai.memory.types import MemoryRecord, MemoryConfig, compute_composite_score

# 1. Create a MemoryRecord with a timezone-aware UTC datetime
record = MemoryRecord(
    content="User prefers Python over JavaScript",
    created_at=datetime.now(timezone.utc)
)

# 2. Attempt to score the record (as done during memory.recall())
config = MemoryConfig()
score, reasons = compute_composite_score(record, semantic_score=0.85, config=config)

Expected behavior

compute_composite_score() should handle both offset-naive and timezone-aware datetimes gracefully without raising a TypeError, normalizing both to UTC before computing age_seconds.

Screenshots/Code snippets

from datetime import datetime, timezone
from crewai.memory.types import MemoryRecord, MemoryConfig, compute_composite_score

rec = MemoryRecord(content="test", created_at=datetime.now(timezone.utc))
compute_composite_score(rec, 0.8, MemoryConfig())

Operating System

macOS Sonoma

Python Version

3.12

crewAI Version

main (latest 1.10.x)

crewAI Tools Version

0.33.0

Virtual Environment

Venv

Evidence

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "crewai/memory/types.py", line 364, in compute_composite_score
    age_seconds = (datetime.utcnow() - record.created_at).total_seconds()
                   ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
TypeError: can't subtract offset-naive and offset-aware datetimes

Possible Solution

now = datetime.now(timezone.utc)
rec_time = record.created_at
if rec_time.tzinfo is None:
    rec_time = rec_time.replace(tzinfo=timezone.utc)
else:
    rec_time = rec_time.astimezone(timezone.utc)

age_seconds = max((now - rec_time).total_seconds(), 0.0)

Additional context

I have already reproduced the bug locally, and have unit tests and a fix ready. I would be happy to submit a pull request for this!