feat(template): ship Chromium by default; record product decisions

- home.packages: chromium active; mime → chromium-browser.desktop
- Decisions: markdown docs stay in-repo; PPD default confirmed
- Formatter + zram still open (explained in session, not closed)

V0: flake check --no-build green.

agent/BACKLOG.md

@@ -115,51 +115,30 @@ _(Identity taste retunes + hand `btop.theme` for white/vantablack/lumon/
 ### v1.0 pointer
 
 See **VISION**. Open PROPOSED: NVIDIA wrappers deferred past v1; IR
-portal (b)/(c) hardware.
+portal (b)/(c) hardware. Browser default = Chromium; power = PPD.
 
 
 ## Decisions `[human]`
 
 Open calls only Bernardo can make; agents add options/evidence but never
-decide.
+decide. **Resolved** entries stay for history; agents treat them as closed.
+
+### Resolved (2026-07-10)
+
+- **Docs site vs Markdown-in-repo** — **markdown in-repo for now**
+  (`docs/`, README). A rendered docs site is FUTURE if wanted.
+- **Default browser** — **ship Chromium** in
+  `templates/downstream/home.nix`; mime → `chromium-browser.desktop`.
+  Opt out: delete the line / override mime.
+- **Default power backend** — **keep PPD** (`nomarchy.system.power.backend`
+  default). TLP remains the one-line opt-in. Rationale: stability + live
+  profile API for menu/Waybar; Omarchy’s TLP experiment reverted.
+
+### Still open
 
 - **Formatter adoption:** repo deliberately has none; `nixfmt-rfc-style`
   would flatten the aligned hand-formatting of ~33 files. Adopt or
-  declare never?
+  declare never? (See reply in session: Nix-source style only, not runtime.)
-- **Docs site vs Markdown-in-repo** (from the docs-review item).
+- **zram swap:** faster under pressure, but interacts with the
-
+  hibernation-swapfile story (resume device/priority). Adopt,
-- **zram swap:** faster under pressure and pairs with NOW#3, but it
+  adopt-with-hibernation-guard, or skip?
-  interacts with the hibernation-swapfile story (resume device/priority
-  ordering) — adopt, adopt-with-hibernation-guard, or skip?
-- **Default browser:** the template comments Firefox out. The shipped
-  mime defaults (item 8, done) point `text/html`/http(s) at
-  `firefox.desktop` as *inert* entries — they activate the moment
-  Firefox is installed and are skipped otherwise, so the remaining call
-  is only: ship a browser active in the suite, or stay
-  browserless-by-default?
-
-- **Default power backend — PPD vs TLP:** (raised by Bernardo 2026-07-08:
-  would TLP be more power-efficient, and should it be the default?)
-  TLP does get more *idle* battery life, but only from device-level knobs
-  PPD deliberately omits — PCIe ASPM, disk/NVMe link PM, USB autosuspend,
-  runtime PM — which are the same knobs behind NVMe/USB flakiness that
-  pillar 1 (rock-stable, never fight your machine) guards against.
-  **Evidence (2026-07-08):** no credible hard-watt benchmarks exist — TLP's
-  own maintainer declines to quote any ("measure on your hardware") and says
-  PPD's power-saver gives *similar* savings under load; TLP's edge is
-  idle-only (linrunner.de/tlp/faq/ppd.html — PPD covers a *subset* of TLP,
-  "no settings to reduce consumption when the CPU is idle"). Our sibling
-  distro **Omarchy** ran this exact experiment — a "replace Power Profiles
-  with TLP for battery" guide — and the author **reverted to PPD** ("more
-  headaches and weird issues"); Omarchy shipped PPD auto-switching instead
-  (basecamp/omarchy#3907). PPD 3.4.0 now does AC/battery auto-switching,
-  closing part of TLP's UX gap. **Cost of TLP-default:** TLP has no live
-  D-Bus profile API, so the `powermgmt` menu + Waybar profile indicator +
-  low-battery auto power-saver (all `powerprofilesctl`) would need a rework —
-  it's not a one-line backend swap. **Agent rec (evidence, not a decision):
-  keep PPD default;** chase battery via targeted low-risk tweaks (PCIe ASPM
-  policy, battery-side EPP, the charge *start* threshold, PPD auto-switching)
-  and keep TLP the documented one-line opt-in it already is
-  (`nomarchy.system.power.backend = "tlp"`). Options: (i) status quo +
-  targeted tweaks [rec]; (ii) TLP default (reworks the profile UX);
-  (iii) nothing.

agent/HARDWARE-QUEUE.md

@@ -143,12 +143,10 @@ that run; leftover open items still need a pass.*
       snapshot flow, "boot an older generation (how)" fires an
       instruction notification.
 - [ ] **Open-a-file smoke (viewers + mime defaults, item 8)** — after
-      `home-update`: from yazi/Thunar, open a PDF (→ zathura, themed to
+      `nomarchy-home`: from yazi/Thunar, open a PDF (→ zathura, themed to
       the palette), an image (→ imv, NOT GIMP), a video (→ mpv);
-      `xdg-open .` on a directory → Thunar. With no browser installed,
+      `xdg-open .` on a directory → Thunar; a link → **Chromium**
-      clicking a link must still fall through to *something sane* (the
+      (`chromium-browser.desktop` — template default as of 2026-07-10).
-      firefox.desktop entries are inert); if you've uncommented a
-      browser, links go there.
 - [ ] **Update awareness** — with `nomarchy.updates.enable`, let the timer
       fire (or start the unit): indicator appears only when inputs are
       behind, notification only on count growth, click opens the upgrade

docs/ROADMAP.md

@@ -287,7 +287,8 @@ Design/decision records and a running log of shipped work (items marked
   `libreoffice-fresh`, `vscode`, `gimp`, `inkscape` — ships *active* in the
   downstream `templates/downstream/home.nix` `home.packages`, with the heavier
   opt-ins (`texliveFull` — multi-GB; `texliveMedium` is lighter — plus
-  browser/email) commented just below. **Decision: no `nomarchy.apps.*` option
+  browser/email) commented just below — **Chromium is active by default**
+  (2026-07-10); other browsers stay commented. **Decision: no `nomarchy.apps.*` option
   surface.** Unlike `nomarchy.services.*` (real config behind each toggle —
   systemd units, subuid ranges, the Flathub oneshot), a bare package install
   has nothing behind the toggle: `mkIf x { environment.systemPackages = [p]; }`

modules/home/mime.nix

@@ -50,13 +50,12 @@ lib.mkIf config.nomarchy.mime.enable {
       # The system-side Thunar (nomarchy.system.fileManager).
       "inode/directory" = "thunar.desktop";
 
-      # The template ships no browser by default (open Decision) — these
+      # Template ships chromium (chromium-browser.desktop). Entry is
-      # are inert until one is installed; firefox is the template's first
+      # skipped by GIO if the package is deleted; install another browser
-      # suggestion. A different browser registers its own handler and
+      # and/or override these keys to retarget.
-      # wins once these entries stay dead.
+      "text/html" = "chromium-browser.desktop";
-      "text/html" = "firefox.desktop";
+      "x-scheme-handler/http" = "chromium-browser.desktop";
-      "x-scheme-handler/http" = "firefox.desktop";
+      "x-scheme-handler/https" = "chromium-browser.desktop";
-      "x-scheme-handler/https" = "firefox.desktop";
     };
   };
 }

templates/downstream/home.nix

@@ -81,6 +81,7 @@
   home.packages = with pkgs; [
     libreoffice-fresh   # office suite (documents, sheets, slides)
     vscode              # code editor (unfree; allowUnfree is on)
+    chromium            # web browser (mime defaults → chromium-browser.desktop)
     gimp                # raster image editor
     inkscape            # vector graphics
     mpv                 # media player
@@ -88,9 +89,8 @@
     # pwvucontrol + calcurse ship with the Waybar module (volume right-click / clock)
 
     # ── More apps — uncomment to add ─────────────────────────────────
-    # Web browsers
+    # Web browsers (chromium ships above — swap/delete freely)
     # firefox
-    # chromium
     # ungoogled-chromium
     # brave                       # (unfree)
     # google-chrome               # (unfree)