feat: observability setup (OTel SDK, OTLP exporter, structured loggin… #37

Job	Run time
Type Check	17s
Coverage	21s
Unit tests	25s
Architecture (import-linter)	12s
Lint & Format	9s
Commit-type sync	11s
Branch-protection contexts sync	13s
Pre-commit	1m 10s
	2m 58s

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