Complete M16 action select circle parity

docs/status/M16-GAP-00111.md

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+# M16-GAP-00111 Status
+
+status: done
+task: WELD modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Mesh WELD modifier stack exposure for `mesh:WebGapWeldMesh`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapWeld` as WELD type code 55 with merge threshold 0.125; save/reopen is exact.
+- WASM/Main exposes the same stack entry and matching merge threshold plus generic visibility flags; save/reopen is exact.
+- Malformed Blend input is rejected without mutating Main.
+- Generator, npm comparator, and direct comparator exited 0.
+
+knownRisk: Weld evaluation remains metadata-only; this slice covers modifier stack transport and merge threshold metadata.
+
+nextTask: `M16-GAP-00112`