The harness stats row (the composer dock's own `stats` entry) gains a
hover underline and opens the Context tab on click or Enter/Space. The
plugin mounts an invisible sibling entry on the officially plugin-facing
`conversation.composer.dock` seat; its anchor spots the single stats row
beside it inside the slot anchor, decorates it in place, and re-spots it
on dock churn (the row mounts only after the first stats exist, and
tooltip bubbles come and go beside it). A drag-selection click is
ignored so copying the numbers never switches tabs.
Every shape without a spotless row degrades to a silent feature-off:
a missing dock seat, ambiguous candidates (other plugins' entries,
crash faces, non-HTML markup), and rows that throw mid-wiring — and
unmount strips every mark and listener. The seat is pinned in the
compat matrix (SLOT_SEAMS) and the bundle smoke counts the new entry.
bowenliang123
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