§3 step 1 treats an environment scope as *eligibility*, not a merge tier:
within a single level a value scoped `@E` shadows the same level's `*`
fallback — it never layers on top of it. The resolver's map-run loop
collected every leading object row regardless of (depth, scope), so a
level holding both an `@E` map and a `*` map would deep-merge the two
(and report a bogus `*` layer in `merged_from`) rather than letting the
`@E` map win alone.
Dedup the sorted candidates by depth before the map run: each level is a
single owner (single-parent tree) with at most one `@E` and one `*` row
per key after env-filtering, and `@E` sorts first, so keeping the first
row per level yields the level's winner. Scalar/tombstone cases already
went through the boundary path and were unaffected; only same-level
map-vs-map mis-merged.
Adds two regression tests (same-level suppression; suppressed `*` stays
invisible to cross-level merge). Found in checkpoint review.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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