Fix cfg target syntax and Windows-only wording in SYNCML_WORKSPACE_PROPOSAL

[Copilot]

Two inaccuracies in the SyncML workspace proposal flagged during review.

Changes

• cfg target syntax: Replace cfg(windows) with cfg(target_os = "windows") in the Cargo.toml snippet to match the repo's established convention (e.g., the existing winreg dependency section).

• Windows-only scope clarification: The original note implied the entire SyncML workspace must be Windows-only (analogizing to dsregcmd). Corrected to reflect that only the ETW capture/trigger commands are Windows-gated; the workspace UI can exist cross-platform with those actions disabled/hidden on non-Windows — consistent with how the dsregcmd workspace actually behaves.

# Before
[target.'cfg(windows)'.dependencies]

# After
[target.'cfg(target_os = "windows")'.dependencies]

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[Copilot]

Pull request overview

Updates the SyncML workspace proposal document to correct platform-gating details so the proposal matches how this repo already handles Windows-only functionality (e.g., dsregcmd commands) and Cargo target-specific dependencies.

Changes:

• Fix the Cargo.toml snippet to use [target.'cfg(target_os = "windows")'.dependencies] (matching the repo’s existing pattern).
• Clarify that only ETW capture/trigger commands are Windows-gated; the SyncML workspace UI can remain cross-platform with ETW actions disabled/hidden on non-Windows.

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