Forge: ended sandboxes read as grey Terminated, not green Completed #5

First real enhancement for the toggleable-enhancements framework (#3, #4).

Problem (UX)

In the Forge sandboxes list (https://forge.coreweave.com/sandboxes/*), a sandbox that has ended shows a green Completed pill with a checkmark. Green reads as healthy/running, so at a glance an ended sandbox looks live. "Completed" also implies the work succeeded, though a sandbox ends this way whether it was stopped or its process exited.

Proposed

A neutral grey Terminated pill with a neutral icon in place of the checkmark.

• Terminated, not Stopped: an ended sandbox cannot be started again — only a new sandbox can be created, optionally from a file-system snapshot. Common cloud usage reserves stopped for "can be started again" and terminated for "ended for good", so Stopped stays free for a future resumable state.
• Caveat to state alongside the clip: the list cannot tell a stopped sandbox from one whose process finished on its own, so a clean natural exit would also read as Terminated.
• Grey reuses Forge's own neutral pill colours (the pill styles itself from --tag-text-color / --tag-background-color; the stylesheet already has a neutral variant), so the proposed state looks native.

Markup (from a saved copy of the page; structure only)

• Each row's status cell is a td[role="gridcell"] whose data-key ends in :status.
• Inside it, a span[data-component="Pill"] holds an icon span[data-icon="checkmark-circle"] (an inline SVG) followed by the text node Completed.
• Class names are build-hashed (e.g. _green_<hash>_51) and will change between Forge releases — target the data- attributes, never the classes.

Tasks

• createRelabel changes only the text node, so the icon element (and the framework's node references) survive
• Hand-written synthetic fixture of a status cell in test/fixtures/ (placeholder IDs only)
• enhancements/forge-sandbox-status.js: relabel + CSS (grey pill, neutral icon)
• Tests: applies, restores the shipped markup exactly, idempotent, leaves other statuses alone
• Verified on the live page with the as-shipped/proposed flip