chore(build): disable sccache and enable incremental compilation locally#6105
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Local rebuilds were routed through a machine-wide sccache wrapper via ~/.cargo/config.toml, negating incremental compilation. Every CI workflow already pins RUSTC_WRAPPER and CARGO_INCREMENTAL as explicit env vars, which take precedence over this file, so CI behavior is unaffected.
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Summary
~/.cargo/config.toml), which disables the benefit of incremental compilation for localcargo build/test/nextest/clippyruns.rustc-wrapper = ""andincremental = trueto the repo's tracked.cargo/config.tomlto restore incremental compilation locally.RUSTC_WRAPPERandCARGO_INCREMENTALas explicit job/step env vars, which take precedence over this config file, and CI's[profile.ci]independently pinsincremental = false.rustflags/[profile.*.build-override], which a prior attempt (af1be7ba, reverted bycf75b63f) added and which slowed down CI with no env-var override available.Test plan
sccache --show-statscompile-request count unchanged across a forced local rebuild (sccache not invoked)cargo build -p zeph-common --verboseshows a directrustcinvocation (no sccache prefix) with-C incremental=...presentRUSTC_WRAPPER=sccache cargo build ... --verbosereproduces the sccache wrapper on demand, confirming env-var precedence matches what CI relies on