Claim Cuey requests before attachment preparation

[wilsonccccc]

Summary

• call the local request-claim tool before Claude inspects attachments or performs other work
• pass the stable native request ID into start_cuey
• stop immediately when another execution already owns the request
• publish the updated skill as version 0.4.28

Validation

• ./scripts/build-plugin.sh
• inspected the packaged CueyClaudePlugin.zip skill content
• git diff --check

[wilsonccccc]

Patch added after review:

• claim_cuey_request handoff with requestId is now a polling path: skip attachment prep/start_cuey and continue get_cuey_result with the returned requestId.
• handoff without requestId remains the only path that returns a short handoff message.

Validation:

• scripts/build-plugin.sh
• git diff --check