feat(plugins): add on_agent_error_callback and on_run_error_callback lifecycle hooks#4974

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STHITAPRAJNAS wants to merge 2 commits intogoogle:mainfrom

STHITAPRAJNAS:feat/lifecycle-error-callbacks-4774

Commits on Mar 31, 2026

feat(plugins): add on_agent_error_callback and on_run_error_callback lifecycle hooks
STHITAPRAJNAS
committed
style: apply pyink + isort formatting to new test files
STHITAPRAJNAS
committed