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_logs.bats

@@ -0,0 +1,55 @@
+#!/usr/bin/env bats
+# tests/test_logs.bats — Tests for 'fs5 logs' command (US5)
+
+bats_require_minimum_version 1.5.0
+
+SCRIPT="${BATS_TEST_DIRNAME}/../fs5"
+
+setup() {
+  export DEVICE_SERIAL="RD51QE202392"
+  export LOG_FILE="/tmp/fs5-test-$$.log"
+  LOG_OUTPUT="/tmp/fs5-logcap-$$.txt"
+}
+
+teardown() {
+  rm -f "${LOG_FILE}" "${LOG_OUTPUT}"
+}
+
+@test "logs --lines: outputs exactly N lines" {
+  run "${SCRIPT}" logs --lines 5
+  [ "${status}" -eq 0 ]
+  local line_count
+  line_count=$(echo "${output}" | wc -l)
+  [ "${line_count}" -ge 1 ]
+  [ "${line_count}" -le 10 ]
+}
+
+@test "logs --lines: exits after printing lines (non-streaming)" {
+  # Should complete within 15 seconds (not hang)
+  run timeout 15 "${SCRIPT}" logs --lines 3
+  [ "${status}" -eq 0 ]
+}
+
+@test "logs --output: writes to file" {
+  run "${SCRIPT}" logs --lines 5 --output "${LOG_OUTPUT}"
+  [ "${status}" -eq 0 ]
+  [ -f "${LOG_OUTPUT}" ]
+  [ -s "${LOG_OUTPUT}" ]
+}
+
+@test "logs --filter: filters by tag" {
+  run "${SCRIPT}" logs --lines 20 --filter "System"
+  [ "${status}" -eq 0 ]
+  # Output may be empty if tag not present, but must not error
+}
+
+@test "logs: --help shows usage" {
+  run "${SCRIPT}" logs --help
+  [ "${status}" -eq 0 ]
+  [[ "${output}" == *"logs"* ]]
+}
+
+@test "logs: exits with code 2 when device not connected" {
+  DEVICE_SERIAL="INVALID_SERIAL_000" run "${SCRIPT}" logs --lines 1
+  [ "${status}" -eq 2 ]
+}