ci(fuzz): run cargo-fuzz with the pinned nightly, not the rolling one - #386
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#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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#378 pinned the fuzz-smoke toolchain install to
nightly-2026-07-01, but the fivecargo fuzz runcommands still calledcargo +nightly— which resolves to the rolling nightly and ignores the pin. The rolling nightly carries therustc_codegen_ssa/operand.rsICE building tokio, soFuzz (smoke)stayed red on main. Change each command tocargo +nightly-2026-07-01 fuzz …so it uses the pinned, ICE-free toolchain the install step provides. (Verified in the failing log: the crashing rustc wastoolchains/nightly-…, notnightly-2026-07-01-….)