[kvlonge]

Why

Formatting selected SQL tests unnecessarily compiled the full project graph, rejected path:tests/... selectors, and invoked native formatting once per SQL body. Large test projects therefore spent most of their time in unrelated discovery and fixture completion.

Changes

• support simple path selection across every formatter-owned SQL root, including tests/
• discover only selected fixture candidates and referenced contracts for contract-aware cleanup
• keep typed-null removal conservative through explicit contract-prefix checks
• batch and parallelize native SQL formatting while deduplicating identical bodies
• batch header parsing and report formatting duration plus checked/changed file counts
• add --fixtures-only for contract fixture cleanup without canonical SQL churn
• add deterministic work-count, absolute latency, and 500/1,000/2,000-file scaling guards

Verification

• focused format unit and integration tests: 38 passed
• formatter performance guards: 3 passed
• focused Rust formatter tests and Clippy passed
• uv sync --all-extras
• make check-ci
• public repository hygiene scan