feat(install): copy templates/downstream and patch install values

Make the downstream template the single source of truth for machine
flakes: nomarchy-install copies flake/system/home/theme-state and
patch-template.py only fills hostname, user, keyboard, detected
hardware, snapper, resume, and password. Install and flake-init users
now share the same commented opt-ins and starter home.packages.

Also: BACKLOG boreal-as-default proposal; installer audit notes;
HARDWARE.md from prior work if uncommitted.

agent/BACKLOG.md

@@ -103,6 +103,15 @@ implement. Bernardo moves accepted items into a tier.*
 
 ### Pre-existing
 
+- **Default theme → boreal**
+  Ship Boreal as the distro default instead of Tokyo Night: root
+  `theme-state.json`, `templates/downstream/theme-state.json` (and any
+  greeter/plymouth fallbacks that hardcode Tokyo Night when state is
+  missing). Preset already exists under `themes/boreal/`. Capture
+  `preview.png` if still missing so the picker looks first-class.
+  Cost: copy/apply palette into seed state files + grep for tokyo-night
+  defaults; V0 contrast, V1/V2 theme apply, V3 visual on hardware.
+
 - **Battery charge-limit — make the toggle instant** `[blocked:hw]`
   (follow-up to the preset toggle shipped 2026-07-07, iteration #55).
   The control-center now has a proper toggle (Off / 80% / 90% / 60% /
@@ -240,15 +249,21 @@ implement. Bernardo moves accepted items into a tier.*
   `rollback`, …). Misleading for direct invocation / scripting.
   Cost: one string in `rofi.nix`.
 
-- **Template / seed state drift**
+- **Template / seed state drift (residual after SoT work)**
   (1) `templates/downstream/theme-state.json` lacks `border` and
-  `settings` keys present in repo root state (eval merges defaults —
-  not a break, but new installs ship a thinner shape); (2) no
-  commented `nomarchy.system.snapper.enable` or `hardware.i2c.*` in
-  `system.nix` despite opt-in convention; (3) installer-generated
-  `home.nix` is minimal (keyboard only) while `flake init` template
-  ships a fat default package suite — product divergence worth
-  documenting or aligning. Cost: small template/docs.
+  `settings` keys present in repo root state (eval merges defaults);
+  (2) no commented `nomarchy.system.snapper.enable` or
+  `hardware.i2c.*` in template `system.nix` despite opt-in convention.
+  Main home/system sync is **Installer consumes template as SoT**
+  below — do that first, then close these residual gaps on the
+  template itself. Cost: small template polish.
+
+- **Installer ↔ template SoT — follow-ups** (shipped 2026-07-09: copy +
+  `patch-template.py`). Remaining: (1) optional CI that the install
+  share ships the same template files; (2) V2 `test-install.sh` after
+  ISO rebuild (HM pre-activate now pulls starter packages — larger
+  closure); (3) residual theme-state / i2c comment polish on template
+  (see residual seed drift item).
 
 - **Secondary docs polish**
   README layout tree omits many real modules and pkgs
@@ -600,6 +615,117 @@ of that doc — design notes live there (§4–§10).*
   Prefer the commented-guidance item first; promote only with
   hardware-queue coverage. Cost: high; `[big]` + `[blocked:hw]`.
 
+### Installer process (audit 2026-07-09)
+
+*Full-path review of live ISO → `nomarchy-install` → disko → config
+generation → offline/online `nixos-install` → HM pre-activate → first
+boot. Philosophy applied: **opinionated, stability-first** — prefer safer
+defaults and fewer install questions over option sprawl. Day-2 firmware /
+fingerprint / re-detect stay in Hardware product above, not in the
+installer questionnaire.*
+
+#### Already strong (do not “fix” with more choices)
+
+- Single whole-disk GPT, UEFI + systemd-boot only; multi-disk RAID /
+  dual-boot / BIOS deferred (ROADMAP LATER).
+- LUKS2 **default** + greeter auto-login (one gate); type-to-confirm wipe;
+  live medium excluded from disk list; careful pre-wipe.
+- BTRFS subvols + snapper on by default; hibernation swap default = RAM;
+  hardware autodetection with **safe defaults on, heavy bits commented**.
+- Offline-capable install (compose-lock, ISO store pin, daemon
+  substituter); HM pre-activate so first boot is themed.
+- No Secure Boot theater; no install-time app-suite *wizard* / custom
+  partitioner / pbkdf knobs. (Starter apps come from the **template**
+  `home.packages` once the installer consumes the template as SoT —
+  see above; not a separate install questionnaire.)
+- Live: no idle suspend (avoids mid-install sleep); WiFi via normal
+  desktop NM path.
+
+#### Bugs (stability contracts — fix, don’t optionalize)
+
+- **Installer swap=0 / unattended LUKS fail-open** — already under
+  *Bugs / broken behavior* above (`"0G"` vs `"0"`; missing
+  `NOMARCHY_LUKS_PASSPHRASE` → cleartext). Same audit reconfirmed both
+  as install-path P0.
+
+- **Offline mode must not silently fall back to network lock**
+  When the network probe fails (or install is offline),
+  `compose-lock.py` failure currently **warns** and runs `nix flake
+  lock` (needs network). That can turn a promised offline install into a
+  hung/partial one. **Fix:** if offline path is active and compose-lock
+  fails → **fail the install** with a clear message (dirty ISO / missing
+  narHash). Network `flake lock` only when the probe said online.
+  Cost: small branch in `nomarchy-install.sh`; V2 offline install test.
+
+#### Safety / clarity (one line each — no new install menus)
+
+- **Review panel: warn when target already has Windows / BitLocker /
+  NTFS / crypto_LUKS**
+  Typed disk-name confirm is solid, but multi-OS machines still risk
+  “wrong disk.” At selection or review, if `lsblk -f`/`blkid` shows
+  BitLocker, NTFS, Microsoft, or existing LUKS on the **chosen** disk,
+  add one explicit line: data will be destroyed. Still single-disk,
+  whole-disk only — **no** dual-boot path. Cost: few lines of probe +
+  review string; V0 + V2 optional.
+
+- **Review panel: offline vs online source line**
+  Review always implies “no network needed” even when the online path
+  (skip full store copy, use substituters) is active. Make the Source
+  line conditional on the same `cache.nixos.org` probe so expectations
+  match. Cost: tiny; V0.
+
+- **User password minimum length = LUKS (8 chars)**
+  LUKS requires ≥8; account password only requires non-empty. Align to
+  8 for one consistent rule — not a strength meter. Cost: one check;
+  V0.
+
+#### Live ISO discoverability (one durable cue)
+
+- **Live: one always-visible “Install Nomarchy” action**
+  Install is only in: 3s notify-send toast, getty helpLine, and
+  tribal knowledge of `nomarchy-install`. No desktop entry / menu row.
+  **One** durable surface on the live host only: e.g.
+  `xdg.desktopEntries` (Terminal=true) **or** a single Tools/System
+  menu item that opens a terminal into `nomarchy-install`. Prefer that
+  over more install-time questions or a second installer UI. Also fix
+  stale `hosts/live.nix` header (“No installer yet” — already in docs
+  drift pack). Cost: live.nix only; V1 ISO rebuild + V2 smoke.
+
+#### Generated config / post-install polish
+
+- **HM pre-activate failure → one durable recovery hint on target**
+  Installer already prints the `home-manager switch` one-liner and logs
+  to `/var/log/nomarchy-hm-preactivate.log`. If pre-activate fails, also
+  drop a small flag file or MOTD snippet on the target so first login
+  still shows the fix after the live session is gone. Avoid permanent
+  first-boot checklists (fwupd/fprintd belong in menu/doctor). Cost:
+  small install-script write; V2.
+
+- **MIGRATION.md: installer snapshot layout vs `@home-snapshots`**
+  Installer creates disko `@snapshots` → `/.snapshots` and a first-boot
+  oneshot for nested `/home/.snapshots`. MIGRATION still speaks of
+  top-level `@home-snapshots` (TuringMachine vocabulary). One paragraph
+  clarifying installer layout vs migration machines prevents wrong
+  expectations. Cost: docs only.
+
+#### Test / pure contracts (after P0 bugs)
+
+- **Installer pure checks + expanded unattended matrix** — overlaps
+  existing *Tooling* items (disko `swapSize` contract, compose-lock
+  py_compile, hardware-db ∈ nixos-hardware). After swap/LUKS fixes:
+  document or script unattended no-swap and explicit no-LUKS paths in
+  `test-install.sh` (env flags only — no interactive options). Do **not**
+  grow the interactive installer questionnaire.
+
+#### Explicit non-goals for the installer (defer)
+
+Do **not** add install-time: dual-boot / preserve partitions, multi-disk
+RAID, Secure Boot/lanzaboote, recovery-key *wizard* (optional silent
+recovery print is the only recovery-key idea worth considering later),
+custom partitioner, online/offline user toggle, app suite selection,
+pbkdf/TRIM knobs, or a second installer frontend. Stability and the
+single golden path win.
+
 
 ## Decisions `[human]`