Replace index-based List access with deque-style getFirst()/getLast() where appropriate, modernize switches to expression form, and update various small APIs (e.g. getFirst() on list-like structures). Remove an obsolete test file. Substantially enhance JobController to integrate cluster backplane and job store: add ownership cache, guardNonOwner/backplaneUnavailable helpers, sticky-410 handling, and backplane-aware flows for job status/result/file endpoints (returning 410 or retryable 503 as needed). Update tests and PDF-to-markdown flow to use PdfMarkdownConverter/TempFile/PdfDocument mocks. Misc fixes across controllers and services (SAML attribute access, audit file access, database backup handling, session registry, interceptors, and team credit service). These changes improve safety for clustered deployments and modernize collection usage and control flow.
Ludy87
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