ci(fuzz): pin the fuzz-smoke nightly toolchain (ICE workaround) - #378
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The rolling `nightly` regressed with a rustc codegen ICE (rustc_codegen_ssa/src/mir/operand.rs) while building tokio in the fuzz-smoke job — an upstream compiler bug unrelated to our code. Pin the fuzz toolchain to a fixed, ICE-free nightly for deterministic CI; bump the date deliberately.
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kingchenc
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…#386) #378 pinned the fuzz-smoke toolchain INSTALL to nightly-2026-07-01, but the five `cargo fuzz run` commands still invoked `cargo +nightly` — which resolves to the rolling nightly, ignoring the pin. That rolling nightly carries the rustc_codegen_ssa ICE building tokio, so Fuzz (smoke) kept failing on main. Point each command at `+nightly-2026-07-01` so it uses the pinned, ICE-free toolchain that the install step actually provides.
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Fuzz (smoke)job started failing with a rustc codegen ICE (rustc_codegen_ssa/src/mir/operand.rs) while building tokio on the rollingnightly— an upstream compiler bug, not our code. Pin the fuzz toolchain to a fixed nightly (nightly-2026-07-01, pre-ICE and compatible with the pinned cargo-fuzz) so CI is deterministic. Bump the date deliberately when a newer nightly is needed. Config-only; no code change.