fix: F010, F024, F044, F043 — shell script and helper fixes (v21.0.2) #233

Job	Run time
cfn-nag (advisory)	21s
bandit (advisory)	7s
CloudFormation Lint	22s
cfn-guard (advisory)	9s
New Handler E2E Coverage Check	4s
Handler Regression Check	4s
Configurator HTML Check	9s
YAML ↔ Configurator Sync Check	6s
Handler Coverage Regression Gate	4s
Lambda Python Syntax	5s
EventBridge Prefix Parity	5s
IAM Completeness (native-dispatch)	4s
Shell Injection Guard	3s
CFN Correctness	5s
BatchSize Floor	4s
	1m 52s

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