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69cfcb7417
The integrated-benchmark "Precompile benchmark revisions" step took ~14 minutes every run. Two causes: 1. The "Cache Rust builds" step cached the multi-GB `bench-work-env/*/pacquet/target` dirs under a 1-minute restore timeout. A restore that large never finished in 60s, so (with `continue-on-error`) the cache silently missed and every run built all four targets cold. 2. `pacquet@HEAD` and `pnpr@HEAD` resolve to the same commit but built in separate clones, compiling the `pacquet` binary twice (same for main). Cache the compiled binaries per *resolved commit* instead: - Orchestrator: a `--reuse-prebuilt-binaries` flag skips the clone + `cargo build` for a target whose output binary is already present (i.e. restored from cache). Targets are built pnpr-first; since a `pnpr@<rev>` build also produces the `pacquet` client binary, a same-revision `pacquet@<rev>` reuses it by copy rather than recompiling the commit. - Workflow: resolve the HEAD/main SHAs, then cache the two `pnpr@<rev>` binaries keyed on the commit (they cover all four targets via the dedup-copy). `main` is a near-certain hit on PRs (stable SHA) and a same-HEAD re-run hits HEAD too, so only a fresh HEAD compiles. Drop the giant `bench-work-env/*/pacquet/target` cache (the small binary caches restore in seconds, with no eviction risk) and keep a cargo-deps + orchestrator-target cache with a realistic 3-minute timeout. A fresh-HEAD run now compiles one workspace once (~half the old work); re-runs and main reuse cached binaries and skip compilation entirely.