refactor: clean up build_package.js and remove unused imports

chore: update .gitignore to remove Python cache entries

.gitignore

@@ -55,10 +55,5 @@ logs/
 # GHA credentials
 gha-creds-*.json
 
-# Python caches
-__pycache__/
-*.py[codz]
-*$py.class
-
 # Log files
 patch_output.log

scripts/build_package.js

@@ -17,7 +17,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import { execSync, spawnSync } from 'node:child_process';
+import { execSync } from 'node:child_process';
 import { writeFileSync } from 'node:fs';
 import { join } from 'node:path';
 
@@ -27,15 +27,7 @@ if (!process.cwd().includes('packages')) {
 }
 
 // build typescript files
-const tscResult = spawnSync('tsc', ['--build'], { stdio: 'inherit' });
-
-if (tscResult.status !== 0) {
-  const failureReason =
-    tscResult.status !== null
-      ? `exit code ${tscResult.status}`
-      : `signal ${tscResult.signal ?? 'unknown'}`;
-  console.warn(`tsc --build completed with warnings (${failureReason}).`);
-}
+execSync('tsc --build', { stdio: 'inherit' });
 
 // copy .{md,json} files
 execSync('node ../../scripts/copy_files.js', { stdio: 'inherit' });