PASS: native flicker fix, EN6.3.0.10 / DE6.3.0.11
EN 12c1f2e40ae35a9d822d8fec9330d02f2188c0495a3d98692fc424dbd9a860e9
DE 44cd83caf221cc8ee98249d2bd7966cf079ec43462d9093e5519cb956a64bae7

Matched native VGA comparison: six actions, three repetitions each, board264px/cell33, same observer/input helper.
Baseline:52 presented frames >=80% white,20 >=90%, peak94.6324% white; peak35453 changed pixels outside intended squares.
New:0 frames >=80% or90% white; peak43.7830% white; zero changed pixels outside intended squares in all18 sequences. Neither run reached95% white. These are observed software presentation samples, not physical monitor FPS.
Strict incremental/full native-expose board RGB differences: zero at cell24,33,43. EN/DE normal launch, moves, depth4, Undo/New, close/reopen pass. Fixed EN memory129184B, +256B; stack49152B and DGROUP size unchanged.
See JSON/CSV and exact observed board frames for scope and limits.
