All ExecuteActivity calls were missing StartToCloseTimeout and
ScheduleToCloseTimeout, causing 'BadScheduleActivityAttributes' errors.
- Added 10min timeout for git operations (clone, worktree, push, merge)
- Added 30min timeout for LLM activities (implementer, which calls Claude)
- Git operations use shared ctxWithOptions context
- LLM activities get their own implCtx with longer timeout
- Added time import
Implements real activity-calling logic in OrchestratorWorkflow and
TaskUnitWorkflow (previously stubs), adds GitDiffActivity, and expands
PlanningActivity's I/O to carry repo path and prior task results.
Adds k8s/ deployment manifests (worker Deployment, orchestrator Job,
Kustomize base) for the poimen-workflows Temporal worker, using a
dedicated Kubernetes namespace `poimen` and Temporal namespace
`poimen-harness` rather than sharing the Temporal server's own
`temporal`/`production` namespaces.
Test