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[executorch][native] Split engine host factories out of the PTN runners - #24531

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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #24356 by @digantdesai
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/digantdesai/183/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/digantdesai/183/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/digantdesai/182/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/digantdesai/183/orig

@diff-train-skip-merge

Pull Request resolved: #24356

Drivers other than `ptn_runner_main` need to link an engine without its runner binary. Each engine's `make_engine_host()` moves into a `*_engine_host` library and `PtnRunner.h` into `engine_host`; the runners are unchanged.

Authored with Claude Code.

Differential Revision: [D128254879](https://our.internmc.facebook.com/intern/diff/D128254879/)

**NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D128254879/)!
ghstack-source-id: 463657752
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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/24531

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@meta-cla meta-cla Bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Nov 3, 2026

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