Complete M16 action select circle parity

docs/status/M16-GAP-00096.md

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+# M16-GAP-00096 Status
+
+status: done
+task: SOLIDIFY modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Mesh SOLIDIFY modifier stack exposure for `mesh:WebGapSolidifyMesh`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapSolidify` as SOLIDIFY type code 33 with thickness `0.275` and offset `0.35`; save/reopen is exact.
+- WASM/Main exposes the same SOLIDIFY stack entry with matching thickness/offset and generic visibility flags; save/reopen is exact.
+- Reader maps Solidify DNA fields with Blender semantics (`offset` to thickness and `offset_fac` to offset).
+- Malformed Blend input is rejected without mutating Main.
+- Generator, npm comparator, direct comparator, and WebEngine build exited 0.
+
+knownRisk: Solidify geometry evaluation remains metadata-only; this slice covers modifier stack transport and base metadata only.
+
+nextTask: `M16-GAP-00097`