feat(doctor): battery health readout (#80)

Report-only cycle_count + retained capacity (charge_* or energy_*) as
% of design on system batteries; soft warn below 70% of design; skip
when attrs missing. NOMARCHY_POWER_SUPPLY_ROOT for the checks.doctor
fixture (test_power has no cycle/design attrs).

Verified: V2 — nix flake check --no-build; checks.doctor green (fake
BAT0 cycles/% + Device-scope ignore); local BAT0 smoke (energy_*).

agent/BACKLOG.md

@@ -55,11 +55,6 @@ runtime-computed `resume_offset` into the boot cmdline, and the dev box runs
 exactly this layout (`/proc/cmdline` verified) but isn't Nomarchy. Steps in
 HARDWARE-QUEUE. Close #76 on PASS.
 
-### 80. Battery health readout (`VISION § C`)
-Report-only: `cycle_count` + `charge_full`/`charge_full_design` % in a
-doctor battery-health line (and optionally the Power menu). sysfs-gated
-so desktops/VMs skip it. Extend checks.doctor with a faked sysfs battery.
-
 ### 81. First-boot welcome card (`VISION § B`)
 One dismissible "you're set" toast on the first session (SUPER+M menu,
 SUPER+T themes, SUPER+? keys, network pointer) — a notification, **not**
@@ -145,9 +140,9 @@ high-ROI, etc.) live in the journal + ROADMAP — not here.*
   2026-07-10). Keep #59 commented install guidance; no
   `nomarchy.hardware.nvidia.*` until a hybrid maintainer + queue.
 
-_(First-boot card, generation readability, battery health, pre-activate
+_(#80 battery health shipped 2026-07-11. Remaining promoted: first-boot
-  flag, dock life, hall of fame → promoted to **NEXT #80–#85**,
+  card, generation readability, pre-activate flag, dock life, hall of
-  Bernardo 2026-07-11.)_
+  fame → **NEXT #81–#85**.)_
 
 ### v1.0 pointer
 

agent/JOURNAL.md

@@ -19,6 +19,21 @@ Template:
 
 ---
 
+## 2026-07-11 — #80 doctor battery health readout
+- **Task:** NEXT #80 — battery health in `nomarchy-doctor` (`VISION § C`).
+- **Did:** Doctor row: `cycle_count` + retained capacity
+  (`charge_full`/`design` or `energy_*`) as `% of design`; system
+  batteries only; soft warn <70% design; skip when attrs absent.
+  `NOMARCHY_POWER_SUPPLY_ROOT` for the VM fixture. Extended
+  `checks.doctor` (fake BAT0 + Device-scope MOUSE0 ignore). HARDWARE §10,
+  ROADMAP ✓, VISION ✓; closed #80.
+- **Verified:** **V2** — `nix flake check --no-build`; `checks.doctor`
+  green; local smoke on real BAT0 (342 cycles, 81% via energy_*) + fixture.
+- **Pending:** Power-menu surface left optional/out of scope (doctor is
+  the product surface for report-only health).
+- **Next suggestion:** #81 first-boot welcome card (highest product ROI)
+  or #85 docs-only hall of fame.
+
 ## 2026-07-11 — Triage: VISION-gap PROPOSED → NEXT #80–#85 (Bernardo)
 - **Task:** Bernardo promoted five of the six fresh VISION-gap pitches
   (all but the wallpapers split, which stays LATER).

docs/HARDWARE.md

@@ -378,11 +378,10 @@ For contributors (and power users who will PR):
 ## 10. Doctor and hardware health (current vs target)
 
 **Today** (`nomarchy-doctor`): failed units, disk space, theme-state
-validity/git, generation age, snapper timer. **No** Wi‑Fi, GPU, fwupd,
+validity/git, generation age, snapper; hardware section self-gates per
-or fingerprint checks.
+machine (NetworkManager, audio sink, GPU smoke, fprintd, fwupd, charge
-
+limit, battery health, hibernate/zram). All read-only; each ✖ prints one
-**Target checks** (queued, all read-only, each failure prints one fix
+fix command.
-command — same doctor contract):
 
 | Check | Pass condition | Suggested fix line |
 |-------|----------------|--------------------|
@@ -391,7 +390,9 @@ command — same doctor contract):
 | GPU accel | `glxinfo`/`vainfo` smoke (if installed) | check `hardwareProfile` / drivers |
 | Fingerprint | if USB VID matched / fprintd unit | `fprintd-enroll` or enable option |
 | fwupd | daemon active; optional “updates pending” warn | `fwupdmgr get-updates` |
-| Battery threshold | if laptop + limit set, sysfs writable | power docs |
+| Battery threshold | if laptop + limit set, sysfs reports it | power docs / restart charge-limit unit |
+| Battery health | cycle_count and/or charge\|energy_full÷design % when sysfs exports them | report-only (warn if <70% of design) |
+| Hibernate / zram | disk swap + resume=; zram active | docs/MIGRATION.md → Enabling hibernation |
 
 ## 11. Option quick reference
 

docs/ROADMAP.md

@@ -363,6 +363,12 @@ Design/decision records and a running log of shipped work (items marked
   `checks.doctor` VM test asserts the `hibernate` row renders. (Gotcha
   recorded: the script runs `set -euo pipefail`, so a no-match `grep` inside
   `$(…)` or a `cond && action` aborts it — use `|| true` and `if`.)
+  ✓ **Doctor battery health (#80, `VISION § C`):** report-only
+  `cycle_count` + retained capacity (`charge_full`/`charge_full_design` or
+  `energy_*`) as `% of design`, system batteries only (not Device-scope
+  peripherals). Self-gates when attrs missing; soft warn below 70% of
+  design. `NOMARCHY_POWER_SUPPLY_ROOT` for the `checks.doctor` fixture
+  (`test_power` has no cycle/design attrs).
 - ✓ **Hibernate double-unlock:** on resume from hibernate the LUKS
   passphrase already gates the machine, but locking hyprlock before sleep
   meant a second password. Fixed by *not locking* before an encrypted

docs/VISION.md

@@ -82,7 +82,7 @@ Reference: [HARDWARE.md](HARDWARE.md) §4–§5, §10.
 |------|--------|-------|
 | **Dock life** | Lid closed + external only, wake, default audio sink on undock | Display profiles exist — polish edge cases |
 | **Hibernate/sleep confidence** | Doctor: resume device, swap size, clean suspend journal | Trust > new power UI |
-| **Battery health readout** | Cycles / charge limit where sysfs allows | Report-only |
+| **Battery health readout** ✓ | Cycles + design capacity % in doctor where sysfs allows | ✓ shipped #80 (report-only; charge limit is a separate row) |
 | **Charge-limit instant apply** | Already PROPOSED `[blocked:hw]` | Keep privilege tradeoff explicit |
 
 ---

flake.nix

@@ -428,8 +428,34 @@
               # sheet must still exit 0 — i.e. the section runs without
               # erroring under `set -euo pipefail`.
               healthy = machine.succeed("nomarchy-doctor 2>&1")
-              for probe in ["NetworkManager", "fingerprint", "fwupd", "VA-API", "hibernate"]:
+              for probe in ["NetworkManager", "fingerprint", "fwupd", "VA-API", "hibernate", "battery health"]:
                   assert probe in healthy, f"doctor hardware section missing a self-gated '{probe}' row:\n{healthy}"
+              # #80 battery health: faked sysfs (test_power has no cycle/design).
+              machine.succeed(
+                  "mkdir -p /tmp/fake-ps/BAT0 && "
+                  "echo Battery > /tmp/fake-ps/BAT0/type && "
+                  "echo System > /tmp/fake-ps/BAT0/scope && "
+                  "echo 150 > /tmp/fake-ps/BAT0/cycle_count && "
+                  "echo 4000000 > /tmp/fake-ps/BAT0/charge_full && "
+                  "echo 5000000 > /tmp/fake-ps/BAT0/charge_full_design"
+              )
+              bat = machine.succeed(
+                  "NOMARCHY_POWER_SUPPLY_ROOT=/tmp/fake-ps nomarchy-doctor 2>&1"
+              )
+              assert "BAT0 health" in bat, f"doctor missing battery health line:\n{bat}"
+              assert "150 cycles" in bat, f"doctor missing cycle_count:\n{bat}"
+              assert "80% of design capacity" in bat, f"doctor missing design %:\n{bat}"
+              # Peripheral Device-scope batteries must not produce a health line.
+              machine.succeed(
+                  "mkdir -p /tmp/fake-ps/MOUSE0 && "
+                  "echo Battery > /tmp/fake-ps/MOUSE0/type && "
+                  "echo Device > /tmp/fake-ps/MOUSE0/scope && "
+                  "echo 9 > /tmp/fake-ps/MOUSE0/cycle_count"
+              )
+              bat2 = machine.succeed(
+                  "NOMARCHY_POWER_SUPPLY_ROOT=/tmp/fake-ps nomarchy-doctor 2>&1"
+              )
+              assert "MOUSE0" not in bat2, f"doctor reported Device-scope battery:\n{bat2}"
             '';
           };
 

pkgs/nomarchy-doctor/nomarchy-doctor.sh

@@ -263,6 +263,61 @@ if [ "$bat_seen" -eq 1 ] && [ "$bat_limited" -eq 0 ]; then
   skip "battery charge limit (none set — charges to 100%)"
 fi
 
+# ── battery health (report-only, BACKLOG #80) ────────────────────────
+# cycle_count + retained capacity (charge_* µAh or energy_* µWh). Same
+# system-battery filter as charge-limit/notify. Self-gates when no
+# battery or the firmware omits the attrs (desktops, bare VMs). Override
+# the sysfs root with NOMARCHY_POWER_SUPPLY_ROOT for the checks.doctor
+# fixture (test_power has no cycle/design attrs).
+ps_root="${NOMARCHY_POWER_SUPPLY_ROOT:-/sys/class/power_supply}"
+bat_health_seen=0
+for bat in "$ps_root"/*/; do
+  [ -d "$bat" ] || continue
+  [ "$(cat "$bat/type" 2>/dev/null)" = Battery ] || continue
+  [ "$(cat "$bat/scope" 2>/dev/null || echo System)" = Device ] && continue
+  name=$(basename "$bat")
+
+  cycles=$(cat "$bat/cycle_count" 2>/dev/null || true)
+  case "$cycles" in ''|*[!0-9]*) cycles= ;; esac
+  # Some firmwares export 0 forever — treat as unknown, not "brand new".
+  if [ -n "$cycles" ] && [ "$cycles" -eq 0 ]; then cycles=; fi
+
+  full=""; design=""
+  if [ -r "$bat/charge_full" ] && [ -r "$bat/charge_full_design" ]; then
+    full=$(cat "$bat/charge_full" 2>/dev/null || true)
+    design=$(cat "$bat/charge_full_design" 2>/dev/null || true)
+  elif [ -r "$bat/energy_full" ] && [ -r "$bat/energy_full_design" ]; then
+    full=$(cat "$bat/energy_full" 2>/dev/null || true)
+    design=$(cat "$bat/energy_full_design" 2>/dev/null || true)
+  fi
+  case "$full" in ''|*[!0-9]*) full= ;; esac
+  case "$design" in ''|*[!0-9]*) design= ;; esac
+  pct=""
+  if [ -n "$full" ] && [ -n "$design" ] && [ "$design" -gt 0 ]; then
+    pct=$(( full * 100 / design ))
+  fi
+
+  [ -n "$cycles" ] || [ -n "$pct" ] || continue
+  bat_health_seen=1
+
+  detail=""
+  [ -n "$cycles" ] && detail="${cycles} cycles"
+  if [ -n "$pct" ]; then
+    [ -n "$detail" ] && detail="$detail, "
+    detail="${detail}${pct}% of design capacity"
+  fi
+  # Soft warn only — wear isn't a doctor "fix", just a heads-up.
+  if [ -n "$pct" ] && [ "$pct" -lt 70 ]; then
+    warn "$name health: $detail" \
+         "battery wear is normal over years — replace when runtime suffers"
+  else
+    ok "$name health: $detail"
+  fi
+done
+if [ "$bat_health_seen" -eq 0 ]; then
+  skip "battery health (no system battery / no cycle or design capacity attrs)"
+fi
+
 # ── hibernate / sleep (BACKLOG #76) ──────────────────────────────────
 # Read-only: is there a working hibernate path? zram is RAM-only and can't
 # hold a resume image, so hibernation needs a disk swap (partition or file)