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Fix source code type errors (#1135)

Resolved mypy type errors in src/ by adding annotations, widening
signatures to accept Optional, and making with_retry generic.

TAG=agy
CONV=8ff0c59a-a8b1-4a7a-81ce-c816a6e3cd62
S
stevemessick committed
f1d556a7628fa91d0c2bcf0cf92ac7504e2b615b
Parent: 16dc0d5
Committed by GitHub <noreply@github.com> on 7/17/2026, 6:04:00 PM