Gate native text-input dependencies behind the voice feature

[senamakel]

Problem

The root crate declares arboard, enigo, and rdev as unconditional dependencies, but their only production users are voice modules:

• src/openhuman/voice/text_input.rs: arboard, enigo
• src/openhuman/voice/hotkey.rs: rdev

Those modules are already compiled only with feature = "voice". Consequently, cargo tree -e normal --no-default-features still retains the native clipboard/input stack. The unconditional arboard dependency also keeps image in slim builds.

Proposed change

• Mark arboard, enigo, and rdev optional.
• Add their dep: entries to the existing voice feature.
• Confirm no always-compiled facade/re-export names their concrete types.
• Validate default, no-default, and desktop-forwarded feature builds on Linux, macOS, and Windows.

Definition of done

• A no-default build contains none of arboard, enigo, or rdev.
• image is absent from a no-voice/no-documents graph unless another real consumer requires it.
• Voice text injection and global hotkey behavior remain covered on supported desktop targets.

[samrusani]

I would like to take this as the narrow follow-up described here. I verified on current main that arboard, enigo, and rdev are unconditional in the root manifest while their production imports are confined to #[cfg(feature = "voice")] modules.

Proposed scope:

• mark the three dependencies optional;
• add their dep: entries to the existing voice feature;
• preserve the default desktop feature set and voice behavior;
• verify the no-default dependency graph excludes them, then run no-default and voice-enabled checks plus the repository feature-forwarding guard.

I will keep this separate from #5202, which lists #5197 as a follow-up and does not make these dependencies optional.

[samrusani]

Update: I closed #5225 as superseded because merged maintainer PR #5314 independently made arboard, enigo, and rdev optional and enabled them through the existing voice feature.

Current main therefore implements this issue's scope, so #5197 can be closed. No further work is needed from my draft.

[M3gA-Mind]

Closing as implemented. As @samrusani noted above, merged PR #5314 made arboard, enigo and rdev optional and enabled them through the existing voice feature — see Cargo.toml:297-299 and the voice feature list on current main. The scope described here is on main.

Thanks for writing it up so precisely, and thanks @samrusani for confirming it and standing down the draft.