[Feature Request] Add command to clear or dismiss bottom screen artifacts/messages

Example artifacts line below the status line:
" ⧉ four-doors · desk2 · president-desk "

There is no way to clear these from the bottom of the screen. They
accumulate one chip per published artifact.

Personally, I think asking Claude to remove them manually, or to stop
watching the task, or to remove each artefact one at a time via speech
or text, is clunky — it interrupts the existing workflow.

Not controllable via the status line: statusLine is a single command
entry, and my statusline script emits no ⧉ (grep, no match). The chip
is harness-rendered.

The chip and the live-updates Monitor appear to be separate objects,
which is why stopping the Monitor does not clear the chip.

Attempted workarounds

1. Asking Claude to remove them — doesn't clear the chip.
2. /tasks — shows the updater monitor, but no per-artefact control:

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Background

Monitors (1)
❯ live updates for artifact https://claude.ai/code/artifact/af938b80-2d32-41af-b674-0931900a7efa (auto-armed on publish) (auto-replying to comments)

↑/↓ to select · x to stop · Esc to close

Pressing x stops the monitor but leaves the ⧉ chip in place.

Ask

A dismiss affordance for the chip row — a keypress, an entry in /tasks
or /artifacts, or have stopping the monitor clear the chip.

Environment Info

• Platform: linux
• Terminal: tmux
• Version: 2.1.263 (also reproduces on 2.1.267)
• Feedback ID: ee2175e6-b631-4e71-9f21-cd254e6943dd

Errors

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