Expose make coccicheck using report rules from the selected kernel and
the shared source policy, including userspace and KUnit sources. Diff
mode selects whole changed sources and headers.
Preserve full native output and record rule initialization, per-input
handling and finalization. Treat parser errors and missing coverage as
incomplete analysis even if spatch returns zero; report source findings
separately.
Add isolated log and policy fixtures. Do not introduce project macro
models, diagnostic exceptions or CI execution.
