feat: support product capture workloads

[intel352]

Summary

• add typed product-capture dispatch support through step.compute_dispatch and step.compute_map strict decoding
• add wfctl compute submit product-capture for targeted testing and smoke workflows
• update workflow-compute dependency to the product-capture protocol/provider commit from GoCodeAlone/workflow-compute#111

Validation

• GOWORK=off go test ./...

[Copilot]

Pull request overview

Adds support for submitting/dispatching the new product-capture compute workload type, including CLI ergonomics and regression tests, and updates the workflow-compute dependency to a protocol/provider revision that includes product-capture support.

Changes:

• Added dispatch step tests covering acceptance of product-capture workloads and strict rejection of unknown nested product_capture fields.
• Added wfctl compute submit product-capture subcommand to construct/validate and submit product-capture tasks.
• Updated github.com/GoCodeAlone/workflow-compute dependency (and indirect pgx) to pick up the product-capture protocol/provider updates.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/steps_test.go	Adds coverage for dispatch step handling of product-capture workload config and strict decoding behavior.
internal/cli.go	Implements compute submit product-capture command and wires it into wfctl compute submit.
internal/cli_test.go	Adds CLI test ensuring product-capture submit emits a compact receipt and does not leak request details.
go.mod	Bumps workflow-compute dependency (and pgx indirect) to versions containing product-capture support.
go.sum	Updates checksums consistent with the module version bumps.

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