Add start_activity action to ScheduleAction and completion_callbacks to StartActivityExecutionRequest#1

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chaptersix wants to merge 3 commits intomasterfrom

Commits on Apr 6, 2026

feat: add start_activity action to ScheduleAction and completion_callbacks to StartActivityExecutionRequest
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Commits on Apr 7, 2026

refactor: extract NewActivityExecutionInfo and remove completion_callbacks
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chore: regenerate openapi docs and update buf.lock
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