feat: Phase 2 act primitives

Add the Artemis Go CLI and its packages:
- internal/adb: timeout-bounded adb wrapper, device list, wireless-debugging
  port scan and auto-connect (never hardcodes the moving port).
- internal/ui: uiautomator dump parsing, find-by-text, tap the centre of a
  text match (FR-4), type, swipe, scroll, back, home, launch, wake.
- cmd/artemis: CLI for the primitives plus 'demo', the Phase 2 DoD run.

Failures are loud: a missing or disabled element errors instead of tapping a
guessed coordinate. The screen is woken before acting, and every adb call has
a deadline.

Also record the section 13 Q4 decision (adb lives in the user profile on .13,
wireless ADB needs no udev rules; service packaging still open until Phase 6),
add unit tests, and document the phase evidence.

go.mod

@@ -0,0 +1,3 @@
+module gitea.lab.audasmedia.com.au/sam/artemis_control
+
+go 1.22