Add infrastructure test coverage: 7 new test files, ~268 tests
New test suites for previously untested infrastructure:
- lib/tests/test-stdlib.sx: 47 pure functions (equality, predicates, math, collections, strings)
- web/tests/test-adapter-html.sx: HTML adapter (islands, lakes, marshes, components, kwargs)
- web/tests/test-adapter-dom.sx: form predicates and constants
- web/tests/test-boot-helpers.sx: callable? predicate
- web/tests/test-page-helpers.sx: pure data transforms (spec explorer)
- web/tests/test-layout.sx: layout component patterns (kwargs, children, nesting, conditionals)
- web/tests/test-tw-layout.sx: tw-resolve-layout (display, flex, gap, position, z-index, etc.)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
giles
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