feat: add android-fs5 CLI toolset

- fs5 entrypoint with status, push, pull, app, shell, logs commands
- lib/adb.sh: ADB wrapper functions with idempotency and --force guards
- lib/output.sh: human + JSON output formatting via Python
- 33 bats tests (6 status, 9 transfer, 7 app, 5 shell, 6 logs) — all passing
- Zero shellcheck warnings
- .env-based config (device serial, log path)
- Spec-Driven Development artifacts in specs/001-android-fs5-management/

Device: exone GmbH FS5 (RD51QE202392, Android 9)

tests/test_transfer.bats

@@ -0,0 +1,87 @@
+#!/usr/bin/env bats
+# tests/test_transfer.bats — Tests for 'fs5 push/pull' commands (US2)
+
+bats_require_minimum_version 1.5.0
+
+SCRIPT="${BATS_TEST_DIRNAME}/../fs5"
+DEVICE_PATH="/sdcard/fs5-test"
+
+setup() {
+  export DEVICE_SERIAL="RD51QE202392"
+  export LOG_FILE="/tmp/fs5-test-$$.log"
+  # Create a temp local file for testing
+  TEST_FILE=$(mktemp /tmp/fs5-push-test-XXXXXX.txt)
+  echo "fs5-test-content-$$" > "${TEST_FILE}"
+  PULL_DEST="/tmp/fs5-pulled-$$.txt"
+}
+
+teardown() {
+  rm -f "${TEST_FILE}" "${PULL_DEST}" "${LOG_FILE}"
+  # Clean up device test file
+  adb -s "${DEVICE_SERIAL}" shell "rm -f '${DEVICE_PATH}/$(basename "${TEST_FILE}")'" 2>/dev/null || true
+}
+
+@test "push: transfers file to device successfully" {
+  run "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")"
+  [ "${status}" -eq 0 ]
+  [[ "${output}" == *"Pushed"* ]]
+}
+
+@test "push: logs the operation to LOG_FILE" {
+  run "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")" --force
+  [ "${status}" -eq 0 ]
+  [ -f "${LOG_FILE}" ]
+  grep -q "PUSH" "${LOG_FILE}"
+}
+
+@test "push: skips if file exists without --force" {
+  # First push
+  "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")" --force
+  # Second push without --force should warn, not fail
+  run "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")"
+  [ "${status}" -eq 0 ]
+  [[ "${output}" == *"--force"* ]] || [[ "${output}" == *"exists"* ]]
+}
+
+@test "push: overwrites with --force flag" {
+  "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")" --force
+  run "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")" --force
+  [ "${status}" -eq 0 ]
+  [[ "${output}" == *"Pushed"* ]]
+}
+
+@test "push: fails with exit code 1 when source file missing" {
+  run "${SCRIPT}" push "/nonexistent/file.txt" "${DEVICE_PATH}/file.txt"
+  [ "${status}" -eq 1 ]
+  [[ "${output}" == *"not found"* ]]
+}
+
+@test "pull: downloads file from device successfully" {
+  # Push first so we have something to pull
+  "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")" --force
+  run "${SCRIPT}" pull "${DEVICE_PATH}/$(basename "${TEST_FILE}")" "${PULL_DEST}"
+  [ "${status}" -eq 0 ]
+  [[ "${output}" == *"Pulled"* ]]
+  [ -f "${PULL_DEST}" ]
+}
+
+@test "pull: pulled file matches original" {
+  "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")" --force
+  "${SCRIPT}" pull "${DEVICE_PATH}/$(basename "${TEST_FILE}")" "${PULL_DEST}" --force
+  run diff "${TEST_FILE}" "${PULL_DEST}"
+  [ "${status}" -eq 0 ]
+}
+
+@test "pull: skips if local file exists without --force" {
+  "${SCRIPT}" push "${TEST_FILE}" "${DEVICE_PATH}/$(basename "${TEST_FILE}")" --force
+  touch "${PULL_DEST}"
+  run "${SCRIPT}" pull "${DEVICE_PATH}/$(basename "${TEST_FILE}")" "${PULL_DEST}"
+  [ "${status}" -eq 0 ]
+  [[ "${output}" == *"--force"* ]] || [[ "${output}" == *"exists"* ]]
+}
+
+@test "pull: fails with exit code 1 when device file missing" {
+  run "${SCRIPT}" pull "${DEVICE_PATH}/nonexistent-file-xyz.txt" "${PULL_DEST}"
+  [ "${status}" -eq 1 ]
+  [[ "${output}" == *"not found"* ]]
+}