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deduplicate static analysis via OBJECT libraries (2.3x build speedup)

Shared test sources (helpers.c, cy.c, etc.) were analyzed by clang-tidy
and cppcheck once per test target -- up to 78 times for the same file
with identical flags. Build OBJECT libraries for shared sources so that
analysis runs once per unique (source, flags) combination. Reduces
translation units from 449 to 139 (69%) and wall-clock build time from
4m33s to 1m57s on 24 cores. All checks remain enabled.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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