ci: pin dtolnay/rust-toolchain action, keep channels via toolchain input - #1
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The stable and nightly refs were the repo's two documented pin-gate exemptions because the ref name carried the channel. Pinning the action commit (2c7215f, master 2026-08-04) and selecting the channel through the explicit toolchain input keeps rolling-channel semantics while closing the mutable-ref surface. The action-pin-gate allowlist is now empty and the gate validates every remote ref. Prepares for org-level sha_pinning_required, which has no allowlist mechanism.
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Org-level sha_pinning_required is being enabled on ArcavenAE, and it has no allowlist, so this repo's two documented pin-gate exemptions (the dtolnay stable and nightly channel refs) would fail workflow startup. The exemption's premise was that the ref name carries the channel; pinning the action commit (2c7215f, master 2026-08-04) and selecting the channel through the explicit toolchain input keeps rolling stable/nightly semantics while closing the mutable-ref surface. The dated-nightly job already passed an explicit toolchain, so only its ref changes. The action-pin-gate allowlist is now empty; the gate validates every remote ref.