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fix: consolidate shared behavior and correct snapshot histories #986

Job	Run time
Classify verification scope	6s
Lockfile consistency	11s
Formatter performance guards	6m 17s
Dense all-rules compile (5000 models)	7m 0s
Fresh-process compile cache (5000 models)	8m 12s
Fresh-process compile cache (10000 models)	9m 56s
Static checks and unit + integration tests	13m 32s
Dense all-rules compile (3000 models)	6m 45s
Fresh-process compile (10000 models)	6m 51s
Fresh-process compile cache (3000 models)	8m 57s
Fresh-process compile (5000 models)	6m 39s
PostgreSQL integration and E2E tests	11m 13s
Fresh-process compile (3000 models)	5m 34s
DuckDB E2E (build core)	8m 8s
DuckDB E2E (build virtual)	9m 46s
DuckDB E2E (build incremental)	9m 39s
DuckDB E2E (virtual environments)	8m 14s
Dense all-rules compile (10000 models)	8m 0s
DuckDB E2E (CLI commands)	9m 23s
DuckDB E2E (CLI data)	5m 36s
DuckDB E2E (integrations)	7m 11s
Dense all-rules compile (1000 models)	6m 20s
Performance guards	0s
Rules performance guards	0s
Verify	3s
	2h 43m 33s