wip: ingest - #1407
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…urable local journal Define immutable batch identities and exact stream seals without requiring business primary keys. Add a bounded local journal with synced durable-prefix markers, restart replay, content-conflict detection, and authoritative-abort fencing. Keep staging independent of existing row allocation and indexes. Add 17 contract cases, JUnit wrappers, and a dependency-free verification script. This is the staging foundation; it does not enable SQL INSERT or implement participant registration, transaction decisions, or committed installation.
…pshot-safe buffer reads Add column-batch RPC, durable decisions, private preparation, idempotent installation through existing indexes, and query publication. Repair buffer prefetch completion, bitmap association, and native reader buffer ownership. Add real-storage and separate-process SQL fixtures. The matching connector E2E passed three independent runs; deployment and GC limitations remain documented.
…ingestion writers Assign independent transaction-local writer IDs to concrete PageSink instances, even when they share a Trino task ID. Persist allocation request tokens for idempotent responses across coordinator restart; bound allocations and fence new writers after transaction sealing or abort. Add seven regression tests including concurrent allocation, replay, conflicting request identities, capacity limits, and existing stream compatibility.
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