docs(adr): M4 entry — ADR-0012 nix bootstrap wiring + ADR-0013 per-user nix.conf#53
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M4 entry ADRs answering the two architectural questions rolled forward from the M3 retrospective: - ADR-0012: Wire LiveNixInstaller from a dedicated `pearlite bootstrap` subcommand, not auto-phase-0 of `apply`. Apply halts at preflight with NIX_NOT_INSTALLED when nix is missing and any host needs Home Manager. Per-host SHA pin lives in the Nickel config under `nix.installer.expected_sha256`. - ADR-0013: `~/.config/nix/nix.conf` stays HM territory; Pearlite writes only the system-wide `/etc/nix/nix.conf` minimum during bootstrap. No `[[managed.nix_conf]]` block; HM's `nix.settings` is the documented per-user surface. Index updated in docs/adr/README.md. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
LiveNixInstaller(M3 PR feat(userenv): NixInstaller trait + LiveNixInstaller + MockNixInstaller #45) from a dedicatedpearlite bootstrapsubcommand, not auto-phase-0 ofapply. Apply halts at preflight withNIX_NOT_INSTALLEDwhen nix is missing and any host hashome_manager.enabled = true. Per-host expected SHA-256 lives in the Nickel host config undernix.installer.expected_sha256.~/.config/nix/nix.confstays Home Manager territory. Pearlite writes only the system-wide/etc/nix/nix.confminimum (experimental-features = nix-command flakes) once during bootstrap. No[[managed.nix_conf]]block instate.toml; HM'snix.settingsis the documented per-user surface.Both ADRs answer the two architectural questions rolled forward from the M3 retrospective (
docs/retrospectives/M3.md§"Actions for M4" items 1 and 3). Index updated indocs/adr/README.md. Mirrors the M2 entry pattern (PR #20: ADR-008 + ADR-009).Test plan
scripts/ci/check-spdx.sh— markdown exempt; passespearlite-audit check .— 1 check, 0 violations🤖 Generated with Claude Code