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fix(refresh): make the HMR memo plumbing — no name, no path, no records (#3633)

#3629 gave the solid-js/refresh memo an empty name so it left owner
paths, but the attribution engine still recorded it: a `create` record
with nodeName "" per component mount (painted `<Counter> ›  · create`),
and a blank-named re-run on every swap. Empty-string residue, not gone.

Observe tiers now have a notion of framework plumbing: the internal
`_plumbing` memo option sets CONFIG_PLUMBING at creation, the observe
`computed()` literal withholds `_name` for it (so `ownerPath` skips it),
and the engine's `excludedNode` reads the bit before the observer-exclusion
walk — creation, re-runs and checks are recorded for nothing it is, while
everything it owns stays observed. The prod literal never carries the bit.

Size: observe tier 17,618 -> 17,670 B (+52), engine 31,625 -> 31,664 B
(+39); prod scenarios byte-identical. Caps ratcheted with notes.

Co-authored-by: Claude via Cursor <noreply@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

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