v0.17.0

A performance fix and two backlog items.

Perf — screenshot decodes the PNG once, not twice. CaptureScreen decoded
each frame in isMostlyBlack and again in downscalePNG (and re-decoded on
every black-retry). Measured: ~85 ms + 18 MB per png.Decode of a 2076×2152
frame. It now decodes once into an image.Image and shares it between the
black-check and the downscale — roughly halving the CPU/allocs of the
most-called tool (screenshot runs after every action in the driving loop). The
byte-in wrappers are kept for the tested undecodable-input path; verified live
that full-res and downscaled captures still decode correctly.

set_battery works on physical devices (closes the enhancement backlog).
The emulator path (adb emu power) is unchanged; a physical device now forces
the values through the framework (dumpsys battery set level/ac). Those persist
until you clear them, so a new reset option restores automatic reporting
(dumpsys battery reset) on either. Verified live that set/reset round-trip.

New — list_gradle_projects (XcodeBuildMCP parity — deeper project
discovery). Runs gradlew projects and returns the module paths of a
multi-module build (:app, :core, :feature:login) so you can point
gradle_build/list_gradle_variants at the right module or address a task with
:module:task. Complements list_gradle_variants (which lists a module's build
variants). Parser unit-tested against the standard gradlew projects tree.

Full Changelog: v0.16.0...v0.17.0