meeting-assistant/openspec/changes/add-cross-platform-build-targets/tasks.md

1. Build Targets

• 1.1 Add explicit macOS and Linux target framework/runtime build coverage.
• 1.2 Keep Windows-only implementations excluded from macOS and Linux builds.
• 1.3 Add platform service registration for unsupported or future macOS/Linux capture and hotkey implementations.

2. Tests

• 2.1 Split platform-specific tests by compilation target or runtime guard.
• 2.2 Add CI/build commands that verify Windows, macOS, and Linux compile targets.
• 2.3 Add at least one portable compile test that proves Windows-only packages are not required by non-Windows builds.