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## Summary
Fix repeated Windows heap-corruption crashes in the installed Tauri
build. The pinned runtime exposes clonable, thread-safe handles whose
unsafe context graph contains Tao's non-atomic `Rc<EventLoopRunner>`.
IPC-worker clone/drop traffic races the event loop's reference count and
can free the runner prematurely.
- Use `Arc` for that internal Windows runner counter, retaining
main-thread confinement of runner state and the target's existing public
threading contract.
- Add an isolated regression using the real pinned Wry runtime's public
handle API, with a negative control that reverses only this counter in a
temporary crate copy.
- Add the Windows regression to CI and document the captured failures,
compatibility rationale and removal criteria.
This is a local compatibility correction for the runtime CodeNomad
ships. [tao#1290](https://github.com/tauri-apps/tao/pull/1290) proposed
the same counter change but was closed **without merging**, because the
underlying contract violation is Tauri moving/cloning the non-Send
target. That distinction is recorded explicitly. Related reports:
[tauri#15408](https://github.com/tauri-apps/tauri/issues/15408) and
[tauri#15793](https://github.com/tauri-apps/tauri/issues/15793).
## Validation
- `node scripts/test-tauri-runner-refcount.mjs --baseline`: **9 native
crashes / 10 negative-control processes; 5 / 5 corrected passes**,
800,000 handle clones plus teardown per process.
- `node scripts/test-tauri-input-deadlock.mjs --baseline`: keydown,
keyup, char, syschar, IME and instrumented IME-boundary checks pass; the
original/reverted negative controls reproduce their expected deadlocks.
- `cargo build --locked --release -p codenomad-tauri`: passes.
- `rustfmt --check` on the new fixture and `node --check` on its runner:
pass.
- Corrected release executable installed locally on the affected Windows
machine, retaining the existing resources and updater verification
public key; original executable and matching new symbols archived
locally.
The runtime reproduction needs no JavaScript or web page. The Virtua
0.53.5 upgrade is absent from the crashing `
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