fix(export): filter dot-notation metrics from Prometheus textfile #750

Job	Run time
P1 - Zombie dependencies (libyear)	8s
P1 - AI hallucination guard (Lychee URL validation)	7s
P0 - License compliance (go-licenses)	22s
P0 - SPDX header validation (repo policy)	7s
Summary	4s
	48s

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