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)

lib/output.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# lib/output.sh — Human and JSON output formatting for android-fs5
+# shellcheck shell=bash
+
+# ANSI colors (disabled when not a terminal)
+if [[ -t 1 ]]; then
+  _RED='\033[0;31m'
+  _GREEN='\033[0;32m'
+  _YELLOW='\033[1;33m'
+  _CYAN='\033[0;36m'
+  _RESET='\033[0m'
+else
+  _RED='' _GREEN='' _YELLOW='' _CYAN='' _RESET=''
+fi
+
+# out_human MSG — print informational message to stdout
+out_human() {
+  echo -e "${_CYAN}${1}${_RESET}"
+}
+
+# out_success MSG — print success message with checkmark
+out_success() {
+  echo -e "${_GREEN}✓ ${1}${_RESET}"
+}
+
+# out_warn MSG — print warning to stdout
+out_warn() {
+  echo -e "${_YELLOW}⚠ ${1}${_RESET}"
+}
+
+# out_error MSG — print error message to stderr
+out_error() {
+  echo -e "${_RED}✗ ${1}${_RESET}" >&2
+}
+
+# out_json KEY=VALUE ... — emit a JSON object from key=value pairs
+# Usage: out_json serial="RD51QE202392" model="FS5" battery_level=85
+out_json() {
+  local -a pairs=("$@")
+  python3 - "${pairs[@]}" <<'PYEOF'
+import sys, json
+
+data = {}
+for arg in sys.argv[1:]:
+    if '=' in arg:
+        key, _, val = arg.partition('=')
+        # Attempt numeric conversion
+        try:
+            if '.' in val:
+                data[key] = float(val)
+            else:
+                data[key] = int(val)
+        except ValueError:
+            # Boolean strings
+            if val.lower() == 'true':
+                data[key] = True
+            elif val.lower() == 'false':
+                data[key] = False
+            else:
+                data[key] = val
+
+print(json.dumps(data, indent=2))
+PYEOF
+}