fix(concurrency): batch-2 hazards C1, H1-H7, M1-M9 (17 fixes)#2847

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hongwei1 wants to merge 12 commits into

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hongwei1:feature/concurrency-hazard-fixes-batch2

Commits on Jun 26, 2026

test(concurrency): add reproductions for 17 follow-up concurrency hazards
hongwei1
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fix(concurrency): propagate bulk-payment batch-reference claim failure (C1)
hongwei1
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fix(concurrency): make consent status transitions atomic (H1, H2, H3, M5)
hongwei1
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fix(concurrency): harden mutable singletons and lazy-init vars (H5, H7, M8, H6, M9)
hongwei1
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fix(concurrency): make Redis rate-limit and idempotency ops atomic (H4, M6, M7)
hongwei1
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fix(concurrency): guard business status transitions and lock TR status update (M1, M2, M3, M4)
hongwei1
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docs(concurrency): document batch-2 hazards (C1, H1-H7, M1-M9) and fixes
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test(concurrency): fix M5 race test to use conditional UPDATE path
hongwei1
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chore: remove sequential test runner (superseded by run_tests_parallel.sh)
hongwei1
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refactor(context): extract processUacAnswer to reduce cognitive complexity
hongwei1
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fix(concurrency): return 404 not 400 for missing transaction request on status lock
hongwei1
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fix(consent): fail visibly when skip-SCA consent vanishes after creation
hongwei1
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