Skip cross-platform deps for Windows builds

[RocketBoyMusic]

Summary

Windows build script only installs OpenTUI cross-platform binaries when requested, which avoids Bun EPERM cache failures on Windows while still allowing full multi-target builds via BTCA_BUILD_ALL=1.

Details

• build only win32 target by default on Windows
• add BTCA_BUILD_ALL=1 opt-in for full multi-platform builds

Testing

• bun run scripts/build-binaries.ts (Windows)

Greptile Summary

Windows builds now skip cross-platform OpenTUI dependencies by default to avoid Bun EPERM cache failures, while Linux builds (CI) continue to build all targets. Windows developers can still build all platforms using BTCA_BUILD_ALL=1.

• Added Target type alias for better type safety
• Introduced BTCA_BUILD_ALL environment variable for opt-in cross-platform builds
• Conditionally installs OpenTUI for all platforms only on non-Windows systems or when explicitly requested
• Changed build loop to use dynamic targetList instead of hardcoded targets array
• Preserves existing CI behavior: both .github/workflows/pr.yml and .github/workflows/publish.yml run on Linux and will build all 5 platform binaries as expected

Confidence Score: 5/5

• Safe to merge - addresses Windows build issues without breaking CI or existing features
• The conditional logic correctly preserves full multi-platform builds on Linux (CI environment) while solving Windows-specific EPERM cache issues. The BTCA_BUILD_ALL=1 escape hatch allows Windows users to opt into full builds when needed. No existing functionality is broken.
• No files require special attention

Important Files Changed

Filename	Overview
apps/cli/scripts/build-binaries.ts	Conditionally skips cross-platform OpenTUI installs on Windows by default to avoid EPERM errors, while preserving full multi-platform build capability via BTCA_BUILD_ALL=1. Logic correctly maintains all-target builds on Linux (used in CI).

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