chore(switch): add minimal love-nx hardware probe

Co-authored-by: Cursor <cursoragent@cursor.com>

tools/switch-probe/README.md

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+# switch-probe — love-nx hardware probe
+
+**NOT FOR RELEASE.** This package is a developer-only diagnostic for Nintendo Switch (love-nx). Do not ship it inside `game.love` or release NRO payloads.
+
+## Purpose
+
+Validate Phase 0 runtime facts on OLED hardware before running the full Gen1Recomp launcher:
+
+- `love.system.getOS()` (expect `NX` on Switch)
+- Window dimensions (`love.graphics.getDimensions()`)
+- Save directory path (`love.filesystem.getSaveDirectory()`)
+- Gamepad / joystick / touch event logging
+
+## Fields shown on screen
+
+| Field | Source |
+| ----- | ------ |
+| OS name | `love.system.getOS()` |
+| Dimensions | `love.graphics.getDimensions()` |
+| Save directory | `love.filesystem.getSaveDirectory()` |
+| `love._os` | Engine boot hint (when available) |
+| Event log | Last 24 `gamepad*`, `joystick*`, `touch*` events |
+
+## Build `.love` (from repo root)
+
+```bash
+(cd tools/switch-probe && zip -9 -r ../../.bazinga/work/switch-probe.love main.lua conf.lua)
+```
+
+Or:
+
+```bash
+mkdir -p .bazinga/work
+zip -9 -j .bazinga/work/switch-probe.love tools/switch-probe/main.lua tools/switch-probe/conf.lua
+```
+
+Deploy beside `gen1recomp.nro` (loose mode) per `docs/switch-development.md`, renaming to `game.love` only for a probe run — use a separate SD folder so probe and game builds do not mix.
+
+## Desktop smoke (optional)
+
+```bash
+love tools/switch-probe
+```
+
+Expect desktop `getOS()`; input events appear when using keyboard/gamepad/touch (if available).

tools/switch-probe/conf.lua

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+function love.conf(t)
+  t.identity = "switch-probe"
+  t.version = "11.5"
+  t.window.title = "switch-probe (NOT FOR RELEASE)"
+  t.window.width = 1280
+  t.window.height = 720
+  t.window.fullscreen = true
+  t.window.resizable = false
+  t.window.highdpi = false
+  t.modules.physics = false
+end

tools/switch-probe/main.lua

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+-- Minimal love-nx hardware probe. NOT FOR RELEASE — dev-only diagnostic.
+-- Draws runtime facts and logs input events to help validate Phase 0 on OLED.
+
+local lines = {}
+local log = {}
+local maxLog = 24
+
+local function push(msg)
+  log[#log + 1] = msg
+  if #log > maxLog then table.remove(log, 1) end
+end
+
+local function refreshStatic()
+  lines = {}
+  local osName = love.system.getOS()
+  lines[#lines + 1] = "switch-probe — NOT FOR RELEASE"
+  lines[#lines + 1] = "getOS(): " .. tostring(osName)
+  local w, h = love.graphics.getDimensions()
+  lines[#lines + 1] = ("dimensions: %d x %d"):format(w, h)
+  lines[#lines + 1] = "save: " .. tostring(love.filesystem.getSaveDirectory())
+  if love._os then
+    lines[#lines + 1] = "love._os: " .. tostring(love._os)
+  end
+end
+
+function love.load()
+  love.graphics.setBackgroundColor(0.08, 0.1, 0.16)
+  refreshStatic()
+  push("load")
+end
+
+function love.gamepadpressed(joystick, button)
+  push(("gamepadpressed %s %s"):format(joystick:getName(), tostring(button)))
+end
+
+function love.gamepadreleased(joystick, button)
+  push(("gamepadreleased %s %s"):format(joystick:getName(), tostring(button)))
+end
+
+function love.joystickpressed(joystick, button)
+  push(("joystickpressed %s #%s"):format(joystick:getName(), tostring(button)))
+end
+
+function love.joystickreleased(joystick, button)
+  push(("joystickreleased %s #%s"):format(joystick:getName(), tostring(button)))
+end
+
+function love.touchpressed(id, x, y, dx, dy, pressure)
+  push(("touchpressed id=%s (%.0f,%.0f)"):format(tostring(id), x, y))
+end
+
+function love.touchreleased(id, x, y, dx, dy, pressure)
+  push(("touchreleased id=%s (%.0f,%.0f)"):format(tostring(id), x, y))
+end
+
+function love.draw()
+  refreshStatic()
+  love.graphics.setColor(0.9, 0.92, 1)
+  local y = 16
+  for _, line in ipairs(lines) do
+    love.graphics.print(line, 16, y)
+    y = y + 22
+  end
+  love.graphics.print("— event log —", 16, y + 8)
+  y = y + 30
+  for _, line in ipairs(log) do
+    love.graphics.print(line, 16, y)
+    y = y + 18
+  end
+end