feat(lang): v2.5 Tier B — string literals, rands(), lookup()#17
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- Lex/parse/evaluate double-quoted string literals with escape sequences - Add StringLit AST node to ExprNode variant - Add rands(min, max, count [, seed]) built-in — seeded deterministic RNG - Add lookup(key, table) built-in — piecewise linear interpolation - Inverse trig, norm, cross, sign, str, chr, ord, len were already in - 16 new [tier-b] interpreter tests + 4 lexer tests; 1056 assertions pass - Add tests/tier_b_test.scad visual test; verified against OpenSCAD output - Fix ImGui_ImplVulkan_InitInfo API break (RenderPass/MSAASamples moved to PipelineInfoMain; CreateFontsTexture removed) from imgui post-2025/09 - Switch Catch2 from vcpkg to FetchContent to avoid MSVC runtime mismatch - Update roadmap: v1, v2, Tier A, Tier B all marked complete Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
PipelineInfoMain, ApiVersion were added in imgui 1.91.9 (2025-09-26). CreateFontsTexture was removed in the same release. Use IMGUI_VERSION_NUM guards so the code compiles against older vcpkg baselines in CI. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
IMGUI_VERSION_NUM threshold was unreliable across vcpkg baselines. IMGUI_HAS_TEXTURES is defined in the same API overhaul that moved RenderPass/MSAASamples to PipelineInfoMain and removed CreateFontsTexture. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds vcpkg-configuration.json with baseline 6b07d2d (imgui 1.92.7). All environments now get the same library versions; removes the brittle IMGUI_HAS_TEXTURES preprocessor guard in favour of the clean new API. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Test plan