docs: update README with comprehensive test results, CLI documentation, and enhanced feature descriptions

- Update key capabilities to include GPU marketplace, payments, billing, and governance
- Expand CLI section from basic examples to 12 command groups with 90+ subcommands
- Add detailed test results table showing 208 passing tests across 6 test suites
- Update documentation links to reference new CLI reference and coordinator API docs
- Revise test commands to reflect actual test structure (

pytest.ini

@@ -17,6 +17,17 @@ addopts =
     --verbose
     --tb=short
 
+# Python path for imports (must match pyproject.toml)
+pythonpath =
+    .
+    packages/py/aitbc-core/src
+    packages/py/aitbc-crypto/src
+    packages/py/aitbc-p2p/src
+    packages/py/aitbc-sdk/src
+    apps/coordinator-api/src
+    apps/wallet-daemon/src
+    apps/blockchain-node/src
+
 # Warnings
 filterwarnings =
     ignore::UserWarning