fix: F018, F029, F030 — runtime peer detector + error classifier (v21… #236

Job	Run time
BatchSize Floor	3s
cfn-nag (advisory)	25s
New Handler E2E Coverage Check	6s
Configurator HTML Check	7s
Lambda Python Syntax	3s
CFN Correctness	4s
CloudFormation Lint	22s
Handler Coverage Regression Gate	5s
IAM Completeness (native-dispatch)	5s
bandit (advisory)	6s
Handler Regression Check	6s
YAML ↔ Configurator Sync Check	3s
cfn-guard (advisory)	6s
EventBridge Prefix Parity	3s
Shell Injection Guard	5s
	1m 49s

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