test(subflow-override-lab): cover parent long-poll and scoped view overrides end to end

[yilmaztayfun]

Summary

• New integration scenario subflow-override-lab. It verifies end to end the runtime feature in feat(subflow): let a parent override a child's long-poll window/roles and scoped views vnext#1028: a parent overriding a SubFlow child's long-poll window and roles, and swapping the view the child's rules selected, per child state or child transition.
• It is a new scenario rather than an extension of authorization-chain-lab: changing that leaf's long-poll would have changed that suite's ack contract (leaf roles=[chain.admin]).

Changes

• Components (core/):
  • Workflows: top → mid → child (a three-level chain for the one-hop check), and parent, parent-short, parent-roles, parent-nolp, parent-legacy (legacy overrides.views regression).
  • plain-child, and six views.
  • OverrideLabSubFlowMapping.csx, OverrideLabAlwaysTrueRule.csx.
  • Everything is generated by build-subflow-override-lab.py.
• Tests (Tests/SubflowOverrideLab, 12 tests, 2 classes):
  • LongPollOverrideTests: the state body reports the parent's window; the fallback job fires on the parent's window; the roles override governs who gets the interaction and who authorize?ack=true admits, through the parent and on the child directly; an override on a state with no long-poll adds nothing; the override does not reach the grandchild.
  • ViewOverrideTests: state-scoped and transition-scoped overrides, including on the directly addressed child; no leak between state and transition views; a legacy map regression check.
• Tests/SubflowOverrideLab/README.md and the TEST-SCENARIOS.md row, in the same commit.
• A follow-up commit records that the long-poll ack job row now persists ExecuteAt (runtime fix 5f60ab4b in vnext#1028).

Test Plan

• VNEXT_BASE_URL=http://localhost:4201 dotnet test tests/Core.IntegrationTests --filter "FullyQualifiedName~SubflowOverrideLab" against the locally built runtime from vnext#1028 (run-docker.sh up core). Result: 12/12, three runs, on runtime e7cb023c and 5f60ab4b.
• Neighbouring suites on the same runtime: AuthorizationChainLab 44 passed (+7 skipped morph-idm provider tests), SubflowOrchestration 22/22, TimeoutLab 3/3.
• Postgres (subflow_override_lab_child.InstanceJobs, JobType=4): after the runtime fix 10/10 rows have ExecuteAt set, versus 0/22 before. ExecuteAt − CreatedAt is 600 / 120 / 5 s: the child's own window, the parent override, and the short override.

Notes

• Depends on feat(subflow): let a parent override a child's long-poll window/roles and scoped views vnext#1028. Against an older runtime the new tests fail: the override is ignored.
• Known gap: the installed @burgan-tech/vnext-schema 0.0.52 does not know the new override fields, so five parent flows fail npm run validate. The SDK publishes the JSON directly (/definitions/publish), so this does not block the tests. The fix is feat(schema): subflow long-poll and state/transition-scoped view overrides vnext-schema#139, then a schema version bump in this repo.
• The lab's SubFlow mapping forwards role headers to the child on purpose. A roles-gated long-poll on a runtime-started child pauses only when the triggering caller's roles are present, and SubflowStarter sends only the headers the mapping returns. This is the consuming parent's decision, as documented in vnext docs/domain/long-poll-termination.md.
• Evidence comes from host logs and postgres. OpenObserve and Elasticsearch were not connected, so there are no trace measurements.

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