ci: move Windows CLI terminal tests to nightly

[limityan]

Summary

• remove the Windows CLI terminal process contracts from the daily CI Rust matrix
• run the same contracts in the Windows nightly package path
• disable incremental compilation and debug symbols for the nightly test profile to bound disk and link cost

Why

The Windows ConPTY step in run 30193605654 took 4 minutes 17 seconds, while its five tests completed in 2.83 seconds; almost all of the time was a separate Windows test-profile compile and link. Keeping that step serialized in daily CI materially extends the Windows critical path.

Nightly retains the native Windows terminal coverage for resize, cancellation, Ctrl+C, and cleanup without making every pull request pay that cost.

Impact

Workflow	Before	After
Daily CI Windows	runs terminal_process_contracts on every PR and main push	keeps cross-platform workspace compilation but omits the Windows process suite
Nightly Windows	packages the Windows build without this process suite	runs terminal_process_contracts before packaging
Linux and macOS	unchanged	unchanged

The observed daily Windows critical path should drop by roughly four minutes. The same cost moves to the weekday nightly Windows package job.

Validation

• ConPTY workflow placement structural assertion
• pnpm run check:github-config
• git diff --check