Add a fixed square-corner radius token

[ctate]

Summary

• Add radius="none" as the supported Native markup token for square corners.
• Resolve none to zero independently of theme radius customization so its meaning cannot be overridden.
• Keep surface content clips aligned with explicit square chrome, including full-bleed children.
• Update schema validation, diagnostics, generated component vocabulary, documentation, and regression coverage.

Why

Native markup authors need a supported, stable way to render square corners without changing the existing radius scale or relying on unsupported styling paths.

Verification

• scripts/gate.sh fast main: docs installation and the complete docs check passed.
• Added canvas regressions for themed radius="none" resolution, button rendering and focus treatment, and square surface content clipping.
• Zig-backed test, validation, and example steps could not run because Zig is unavailable in the environment. The surface-claims step could not resolve the existing @typescript/old dependency.

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Project	Deployment	Actions	Updated (UTC)
native-sdk	Ready	Preview, v0	Aug 24, 2026 10:09pm
native-sdk-schema	Ready	Preview, v0	Aug 24, 2026 10:09pm