refactor(db): unwind vestigial worker source plumbing (ADR-0052 follow-up)
ADR-0052 moved success journaling out of the worker to the dispatch layer, leaving the `source` that handlers threaded purely for the worker's old history.log write dead. Remove it: - drop `_source` from finalize_persistence and do_rebuild_from_text - inline + delete the three read-only *_request wrappers - drop the now-unused `source` param from the ~30 forwarding worker handlers (leaf + composite), compiler-guided - remove the `source` field from the DescribeTable/QueryData/RunSelect requests and their DatabaseHandle methods (call sites updated) The only worker `source` left is the snapshot/undo label (snapshot_then / stage_pre_mutation / begin_batch). Purely mechanical, no behaviour change. 2471 pass / 0 fail / 1 ignored, clippy clean.
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