Expose CI log step metadata

[121watts]

Summary

• regenerate the CI API proto with step_key, optional step_id, and optional step_name on log lines
• keep streaming de-dupe keyed on the stable Depot step_key
• include step_key, step_id, and step_name in JSON and NDJSON log output while leaving plain log output unchanged. this is particularly useful for visualizing and parsing parallel steps.

Verification

• make generate
• gofmt -w pkg/api/ci.go pkg/api/ci_test.go pkg/cmd/ci/logs.go pkg/cmd/ci/logs_test.go
• go test ./pkg/api ./pkg/cmd/ci
• go test ./...
• git diff --check

Depends on: https://github.com/depot/api/pull/3637
Linear: DEP-4399

---

Note

Medium Risk
Changes the LogLine protobuf schema and JSON log output fields (renaming the primary correlation field and adding new metadata), which may impact downstream consumers expecting the old step_id semantics.

Overview
Updates CI log lines to carry a stable Depot correlation key (step_key) plus optional user-authored step_id/step_name in the v1 protobuf (ci.proto regen).

Adjusts log streaming de-dupe to key on step_key instead of step_id, and extends depot ci logs --output json/NDJSON events to include step_key, step_id, and step_name while leaving plain text output unchanged (tests updated accordingly).

^{Reviewed by Cursor Bugbot for commit 3f084b7. Bugbot is set up for automated code reviews on this repo. Configure here.}

[linear-code]

DEP-4399 Expose workflow step IDs and names in CI log line metadata