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"body": "## Summary\n\nCI setup dominated every job — per-step timings from recent successful runs:\n\n| Job | Setup | Actual work |\n|---|---|---|\n| build (self-hosted macOS) | **8.1m** | 3.5m Tauri build + 1.3m tests |\n| TypeScript (ubuntu-latest) | **10.9m** | ~30s of `tsc --noEmit` |\n| Treefmt (ubuntu-latest) | **11.3m** | seconds of `nix fmt` |\n| Rust Check (self-hosted macOS) | **10.1m** | 1.3m `cargo check` |\n\nThe macOS VMs are ephemeral and ubuntu-latest is stateless, so every run re-installed the devenv CLI from unpinned `github:cachix/devenv/latest` (~70s) and re-evaluated/built the full devenv profile (~5–10m) — including **compiling CPython from source with gcc**, because `languages.python` resolves via nixpkgs-python whose binary cache was never configured.\n\nChanges:\n\n- **Setup action**: cache the devenv profile's store path (plus its exported env vars) in `actions/cache`, keyed on `devenv.*` / `flake.*` / `treefmt.nix` / `nix/**` per OS/arch. Warm runs skip the devenv CLI and eval entirely — `nix build <store-path>` substitutes the closure from cachix (the closure lands in the darkmatter cache via cachix-action's existing post-job push). If substitution fails, the action logs it and falls back to the full build, which self-heals the cache.\n- **Setup action**: pin the devenv CLI to `v2.1.2` (was `latest` — slow tag resolution and non-reproducible), installed via `nix build` instead of `nix profile install` (no profile-manifest lock contention between concurrent jobs).\n- **Setup action**: add the `nixpkgs-python` cachix substituter so CPython substitutes instead of compiling.\n- **Evaluate / TypeScript**: drop nix entirely — `oven-sh/setup-bun` (version from `packageManager`) + `bun install` + `tsc`. ~11m → ~2m.\n- **Evaluate / Treefmt**: new `install-devenv: false` input — `nix fmt` only needs the flake formatter. ~11m → ~2m.\n- **build.yaml**: move the Graphite `optimize_ci` gate to `[self-hosted, linux]` (matches danger.yml) so it stops queueing on/holding the scarce macOS runner slots.\n\nExpected steady state: ~8–9 min saved per job on the mac/ubuntu jobs, plus reduced mac-runner contention (merge-group runs were reaching ~48m wall clock largely from queueing). The first run after any devenv/nix input change still pays one full build per runner class — that's the cache warming. Behavior is otherwise unchanged: same profile contents, same env vars exported, rustup still wins on PATH for builds.\n\nReviewer notes:\n- The very first runs on this PR build the cache (slow); subsequent pushes should show the fast path. The `Substitute cached devenv profile` step logs a clear message when it falls back.\n- Bump the `devenv-profile-v1` key namespace if the `.devenv-ci` pointer format ever changes.\n- Follow-ups deliberately not done here: trim Swift/Python/nix-Rust out of the CI closure (CI never uses them; rustup wins on PATH), and bake Nix into the Tart VM image to remove the remaining ~60s installer cost.\n\n## Test Plan\n\n- [x] actionlint + shellcheck + YAML parse clean on changed files\n- [x] Store-path extraction grep and `nix build <store-path> --out-link` substitution verified locally\n- [x] `github:cachix/devenv/v2.1.2` confirmed to evaluate and substitute\n- [ ] CI on this PR: first run warms the per-arch caches; a follow-up push should show warm-path setup times (~1–2m)\n\n## Docs\n\n- [x] No docs update needed\n\n🤖 Generated with [Claude Code](https://claude.com/claude-code)",
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"body": "\n<!--\n 0 failure: \n 0 warning: \n 1 messages\n 2 markdown notices\n DangerID: danger-id-Danger;\n-->\n\n\n\n<table>\n <thead>\n <tr>\n <th width=\"50\"></th>\n <th width=\"100%\" data-danger-table=\"true\">Messages</th>\n </tr>\n </thead>\n <tbody><tr>\n <td>:book:</td>\n <td>\n\n :robot: This PR touches CI / infra — reviewers please pay extra attention:\n- `.github/workflows/build.yaml`\n- `.github/workflows/evaluate.yml`\n </td>\n </tr>\n </tbody>\n</table>\n\n## :clipboard: PR Overview\n\n| | |\n| --- | --- |\n| Lines changed | **154** (+126 / -28) |\n| Files | 0 added, 3 modified, 0 deleted |\n| Draft / WIP | no |\n| Has Test Plan | yes |\n| No Test Plan Needed | no |\n| New UI components | no |\n| New Storybook stories | no |\n| New Rust modules | no |\n| New TS source files | no |\n| New tests | no |\n| package.json touched | no |\n| Cargo.toml touched | no |\n| Infra / CI touched | yes |\n\n\n## :microscope: Coverage\n\n| Report | Lines | Statements | Functions | Branches |\n| --- | --- | --- | --- | --- |\n| `apps/native/coverage/coverage-summary.json` | 24.7% | 24.9% | 23.6% | 16.8% |\n\n<p align=\"right\">\n Generated by :no_entry_sign: <a href=\"https://danger.systems/js\">dangerJS</a> against 6b6b10fa5a73f99294fd9749c4dfe7172384bc6a\n</p>\n",
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