fix(scripts): improve env loading in bun wrapper and add --help to de… #5108

Job	Run time
build-and-check	2m 23s
test-npm-app	47s
test-common	40s
test-cli	1m 6s
test-packages/agent-runtime	49s
test-web	44s
test-.agents	41s
test-integration-npm-app	40s
test-integration-backend	39s
test-integration-.agents	1m 19s
test-integration-cli	1m 16s
test-integration-packages/billing	47s
test-backend	45s
test-packages/internal	43s
test-sdk	46s
test-packages/billing	42s
test-integration-sdk	55s
test-integration-common	42s
test-integration-packages/internal	43s
test-integration-packages/agent-runtime	43s
test-integration-web	37s
	18m 27s

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