docs: add NEXT-STEPS note (activity recording + resume context)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/superpowers/NEXT-STEPS.md

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+# Next steps
+
+Scratch continuity note for resuming work (e.g. on another machine). The
+authoritative design lives in `specs/2026-07-02-padel-scoring-design.md` and
+`plans/2026-07-02-padel-scoring.md`.
+
+## Current status (2026-07-05)
+
+- Scoring app is **implemented and working**: UI-free `PadelMatch` engine
+  (17 unit tests pass in the sim), `CourtRenderer`, `HeartRateProvider`, and
+  the View/Delegate/App. Built and verified in the Connect IQ simulator and
+  sideloaded to a real Venu 4 (venu445mm).
+- UI has been refined beyond the plan: top **HR arc gauge** in Garmin zone
+  colors (grey/blue/green/orange/red) with a marker on the current zone and
+  the bpm number below; **proper padel court** (net centered, service lines at
+  the 3m-from-back-wall proportion, center line only between service lines),
+  wider with a configurable blue surface (`bgColor` on `CourtRenderer`); serve
+  ball marks the back zone; games column white, sets accent green, "Pts"; HR +
+  time on a matched `FONT_MEDIUM`.
+- All committed on `main` and pushed to https://scm.vilanet.fr/kriss/garmin-padel.
+
+## Build / run reminder
+
+- `developer_key` is git-ignored (private signing key) — provide it out of band.
+- SDK: connectiq-sdk-mac-9.2.0. Device: `venu445mm`.
+- Build: `"$SDK/bin/monkeyc" -f monkey.jungle -o bin/garmin-padel.prg -y ./developer_key -d venu445mm`
+- Run: `"$SDK/bin/connectiq" &` then `"$SDK/bin/monkeydo" bin/garmin-padel.prg venu445mm`
+- Unit tests: build with `--unit-test` then `monkeydo bin/test.prg venu445mm -t`
+  (monkeydo's exit code 1 is a known simulator artifact; trust the in-app
+  `passed/failed` summary).
+
+## Input gotcha (important)
+
+The **simulator merges the back-swipe and the physical back button** into one
+`onBack`, so swipe-left appears to exit the app there. On **real hardware** they
+are separate: swipe-left reaches `onSwipe(SWIPE_LEFT)` (→ undo, consumed) and
+the physical button triggers the default back (→ exit). The delegate relies on
+this — test back/undo behavior **on the watch, not the sim**.
+
+## Next feature: record a padel activity
+
+The app currently only *displays* the score + a live HR readout; it does **not**
+record a Garmin activity (spec §8 deferred). Add session recording via
+`Toybox.ActivityRecording`:
+
+- create/start a session (find the best sport type — native padel/racquet if
+  the Venu 4 exposes one, else a generic training/sport type),
+- pause/resume, and save-or-discard at match end (appears in Garmin Connect
+  with duration, HR zones, calories),
+- likely show an elapsed activity timer on screen.
+
+**Open design questions to settle first (do a brief brainstorm/spec pass):**
+- Auto-start the session on launch, on the first point, or via an explicit start?
+- Which sport type is available on venu445mm?
+- Save prompt at match end (save / discard / resume)?
+- Where to surface the elapsed activity timer in the layout?
+
+## Other deferred items (spec §8)
+
+- Settings screen driving `RulesConfig` (golden point, sets, tiebreak) and the
+  top/bottom info slots (incl. the court color already wired as `bgColor`).
+- Match history.
+- Resume-after-close persistence.