ci: declare workflow-level contents: read on 16 build/regen workflows

[arpitjain099]

Pins the default GITHUB_TOKEN to contents: read on every workflow in .github/workflows/. They are all native-library binding regen workflows (angle, assimp, dxvk, glfw, moltenvk, openal-soft, sdl2, shaderc, spirv-cross, spirv-reflect, swiftshader, vkd3d, vulkan-loader, wgpu) plus bindings-regeneration and codeowners checks. None of them call a GitHub API beyond the initial checkout.

Why

CVE-2025-30066 (March 2025 tj-actions/changed-files supply-chain compromise) exfiltrated GITHUB_TOKEN from workflow logs. Pinning per workflow caps runtime authority irrespective of the repo or org default, gives drift protection if the default ever widens, and is credited per-file by the OpenSSF Scorecard Token-Permissions check.

YAML validated locally with yaml.safe_load on each touched file.

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