fix: suppress prompt channel when usageDisplay is output-only

[ComBba]

Summary

• Fix [HUD] tool state messages leaking into prompt input area when usageDisplay is output (default)

Problem

dispatchReducerEvent unconditionally passed promptClient to dispatchHudTransition, causing coexistence to emit [HUD] grep status=done duration=2282ms messages into the prompt input area — even when the user had usageDisplay: "output" (the default).

Fix

Only pass promptClient when usageWantsPrompt(runtimeConfig.usageDisplay) returns true (i.e., usageDisplay is "prompt" or "output+prompt").

Verification

• npm run ci passes (332 tests, typecheck, build)

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📥 Commits

Reviewing files that changed from the base of the PR and between 0d4f33e and e5046af.

📒 Files selected for processing (1)

• src/plugin.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/suppress-prompt-in-output-mode

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