Document SCS.1 and expose make scs_lint for the common C source/header
scope, including userspace and KUnit. Adapt engine's OCS.7.5 check to
SCST_KUNIT_VISIBLE, SCST_KUNIT_VISIBLE_INLINE and VISIBLE_IF_KUNIT.
Require each annotation to occupy its own line; leave other function
attributes and source warnings unchanged.
Use Tree-sitter to distinguish code from comments, literals and
preprocessor directive contents while checking every conditional
branch. Pin the parser dependencies and run them through uv.
Support whole-tree, DIFFBR and explicit-file selection without new
exclusions or diagnostic exceptions. Retain findings and checked-file
records even when a later input fails. Add isolated rule, diff-mode,
coverage and read-failure fixtures with a separate test target.
