Release v0.19.15

[github-actions]

Automated release PR for v0.19.15 (version bump + release notes). Merged automatically once required checks pass; the tag, GitHub release, and PyPI publish steps then run in run 32120032194 of the Release Python Package workflow.

[github-actions]

Import	Time
import llamabot	0.068s
from llamabot import SimpleBot	0.238s
from llamabot import AgentBot	0.075s
from llamabot import ToolBot	0.460s
from llamabot import tool	0.430s
from llamabot import prompt	0.431s
from llamabot import user, system	0.241s
from llamabot import span	0.429s
from llamabot import ChatMemory	0.243s
from llamabot import Experiment	0.438s
from llamabot import QueryBot	0.436s
from llamabot import ImageBot	0.251s
from llamabot import StructuredBot	0.414s
from llamabot.recorder import span	0.393s
full (import everything)	0.471s

[github-actions]

PR Preview Action v1.8.1
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