docs(architecture): adopt PostgreSQL persistence baseline #85

Job	Run time
Internal & External Link Validation	2m 16s
Markdown Lint & Style	21s
Bilingual Documentation Sync	8s
ADR Numbering & Status	6s
Sensitive Information Scan	6s
MASTER_INDEX Navigation	6s
Mermaid Diagram Syntax	34s
Documentation Quality Gate	4s
Documentation QA Report	7s
	3m 48s

Provide feedback