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perf(dev): add agent:preflight with a shared content-keyed build cache Agent worktrees each built the Runner from nothing: a cold cargo debug and release build, the Runner TypeScript build and its checks, about 8 minutes per fresh worktree on a loaded machine. `pnpm agent:preflight` replaces the manual install + Runner build sequence. It skips steps whose inputs are unchanged and reuses other worktrees' results from ~/.cache/paperclip/agent-build: - Runner and eval-kernel dist, keyed by the Runner build-input digest and the toolchain - Runner debug binaries, keyed by every file the Rust build reads - a cargo seed with third-party crates only; the Runner crate is scrubbed because cargo records its out-of-package includes by absolute path Entries are written once with an atomic rename and restored as APFS clones. Also exclude provider-assets from the Runner build inputs. The build writes that directory itself, so the first build in every fresh checkout saw its inputs change and never recorded a build stamp. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>