Verify shared workload publication and failed-generation isolation - #517
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…gh production processes
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Before this PR
The whole-backend process fixture used an obsolete publication request, APPLIED instead of STAGED, and summary payloads without frame lineage. It no longer exercised the current deployment contract.
After this PR
Two quantile roots publish one producer. The emitted plan passes the actual ASAPCollector library validator and runtime-config projection. Production control-plane and data-plane processes exchange a current staged plan and consume generation-bound OTLP checkpoints; both readouts return the expected values. An injected Collector staging failure leaves the old active plan and warm result unchanged, and a frame from the rejected generation is rejected.
Verification
Built the production control-plane binary and ran backend_process_e2e successfully. Collector acknowledgement is simulated; Collector plan decoding/projection uses its real library, not a duplicate backend schema. This does not claim a real Collector process or its raw-update loop ran. Quantile fixtures use integral ranks; arbitrary PromQL interpolation conformance is not claimed.
Stacked on #516. No automatic merge or independent review.