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?
-- **Docs site vs Markdown-in-repo** (from the docs-review item).
-
-- **zram swap:** faster under pressure and pairs with NOW#3, but it
-  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.
+  declare never? (See reply in session: Nix-source style only, not runtime.)
+- **zram swap:** faster under pressure, but interacts with the
+  hibernation-swapfile story (resume device/priority). Adopt,
+  adopt-with-hibernation-guard, or skip?

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,
-      clicking a link must still fall through to *something sane* (the
-      firefox.desktop entries are inert); if you've uncommented a
-      browser, links go there.
+      `xdg-open .` on a directory → Thunar; a link → **Chromium**
+      (`chromium-browser.desktop` — template default as of 2026-07-10).
 - [ ] **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