refactor(objectql): ObjectQL#delete's body moves into its facet (codemod R10 puts the module on the statics route)

.changeset/30020-objectql-delete-facet.md

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+---
+'@objectstack/objectql': patch
+---
+
+refactor(objectql): the `ObjectQL#delete` body moves into the delete-and-aggregate facet
+
+Clause-②: no
+Metadata-protocol: none
+
+- The body of `delete` moves out of `engine.ts` into `engine-delete-and-aggregate.ts`, beside `aggregate`. The method stays on the class as a one-call stub with its signature and its docblock. Where the body handed the engine itself on (`ql: this` in the hook context), it reads the same engine through the host's `facade` entry, and its one static read (the reference probe batch size) goes through the forwarder the other facets already use.
+- No behaviour changes and nothing to do on upgrade: the same statements run in the same order. The built declaration files are unchanged; the source maps move.