[KillerX]

Bumps go.temporal.io/sdk from v1.45.0 to v1.50.0 (API v1.62.14 → v1.63.5, nexus-rpc v0.6.0 → v0.7.0). It's groundwork for using task queue priority, fairness and custom slot suppliers on the workers. v1.45 already has those APIs, and v1.50 drops the experimental label from priority.

Changes

• Go 1.25.8 → 1.26.0. SDK v1.49 raised its minimum Go version.
• publish.yml pinned Go '1.25'. It now uses go-version-file: go.mod, like ci.yml.
• potential_improvements.md: notes found along the way: ACTIVITY_COUNT vs the "one activity at a time" comment, ffmpeg 9 incompatibilities in services/transcode, and tests that need network access.

Release notes v1.46 → v1.50 that touch us

• None of the APIs with breaking changes are used here: custom data or failure converters, WorkflowRandomStream, the Google ADK contrib module, external-storage options, GetHeartbeatDetails/GetLastFailure.
• Child-context cancellation now follows creation order by default (v1.50). This is gated by an SDK flag recorded per history, so open workflows replay unchanged.
• Workers can auto-enroll in poller autoscaling if the namespace advertises it (v1.47). This only affects pollers left at their defaults.
• temporal_activity_execution_failed gained a failure_reason label, so dashboards on it split into one series per reason.
• Slot-supplier/tuner API is unchanged.

Testing

• go build ./..., go vet ./... and go mod tidy -diff pass.
• go test -race ./... has failures in services/cantemo and services/telegram, which need network access, and in services/transcode, because the local ffmpeg is 9.0.1. The same tests fail on master.
• workflowcheck hasn't run locally yet. CI's make test covers it.
• Images that build with Go 1.25 need bumping to 1.26.

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