fix: remove tracked runtime files and update .gitignore

- Add contracts/artifacts/, *.dbg.json, cli/build/, dev/test-nodes/*.log to .gitignore
- Remove tracked contract artifacts from git
- Remove tracked build artifacts from git
- Remove tracked test logs from git

.gitignore

@@ -225,6 +225,10 @@ packages/solidity/aitbc-token/typechain-types/
 packages/solidity/aitbc-token/artifacts/
 packages/solidity/aitbc-token/cache/
 packages/solidity/aitbc-token/node_modules/
+contracts/artifacts/
+*.dbg.json
+cli/build/
+dev/test-nodes/*.log
 
 # Local test fixtures and E2E testing
 tests/e2e/fixtures/home/**/.aitbc/cache/