Add labs: 59 Python lab scripts + tools + run_lab.sh

- labs/src/: 59 lab scripts covering OA API (Ch2-Ch25 + extras)
  - All C++ references removed, oapy-only documentation
- labs/tools/: debug and test utilities
- labs/run_lab.sh: lab runner with LD_PRELOAD and env setup

labs/tools/_debug_path.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+import sys, os
+__dir__ = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.join(__dir__, '..', 'build'))
+sys.path.insert(0, __dir__)
+print(f'cwd: {os.getcwd()}')
+print(f'__dir__: {__dir__}')
+print(f'abs path: {os.path.join(__dir__, "lab13_1_dir")}')
+from utils import init_oa, create_lib, make_oa_name, make_oa_string, get_namespace
+init_oa()
+ns = get_namespace('native')
+dirname = os.path.join(__dir__, "lab13_1_dir")
+print(f'Creating at: {dirname}')
+import shutil
+if os.path.exists(dirname):
+    shutil.rmtree(dirname)
+sn_lib, lib = create_lib("lab13_1_lib", dirname)
+print(f'OK')
+lib.close()
+shutil.rmtree(dirname)