[masarray]

Frozen checkpoint

• Exact CI-green combined FAT: 30a7f18e8e575604eb1306c96753daab9f9c4a51, immutable reference branch checkpoint/arsas-fat-green-20261020, Actions run 39404069355: all 11 CI workflows success, 2409 ARSAS + 24 engine + 6 packaged regression tests and portable smoke green.
• User-tested 2026-10-20 field diagnostic application SHA de71a1a45c30d0221766c389d96553e051b20c17 on checkpoint/arsas-field-command-stable-20261020, with identical source tree to green FAT, positive SBOw/Operate/termination and feedback, ~414–461 ms valid click-to-result. Do not conflate local ~400ms post-SBOw wait with wire/IED termination latency.

Exactly Phase 1 only — visual change

• Copy user-supplied exact filled SVG path contours for chevron DOWN / UP and power into immutable WPF Geometry resources. No raster scaling, external assets or new dependencies.
• Scoped CommandDockTransparentHeaderExpander template only on CommandPanelExpander: white SVG on transparent dark header, chevron swaps via IsChecked/IsExpanded, accessible keyboard-click header, transparent interaction and keyboard focus indication only.
• Remove 28x28 light-blue power card. Power becomes white glyph beside Command Dock label, keeping header target badge.
• Reuse same Expander instance and original CommandPanel_Expanded/Collapsed handlers, DataGrid, command confirmation, typed control, SBOw/Operate and report traffic unchanged. No timers or MMS calls.
• Add P109X source/markup regression and checkpoint document.

Important exclusions / release gate

Phase 2 thin under-IP discovery line deliberately not implemented in this PR. Do not merge to main without Windows exact-head build + packaged portable smoke and visual FAT at 100/150% DPI (up/down state, keyboard toggle, tab navigation, no flicker). No claim of physical relay qualification from code CI.

[masarray]

Disposition: Superseded (fully preserved UI checkpoint) — safe closure of intermediate historical PR tracking, not an application merge or release acceptance.

Canonical replacement: #649 retains the cumulative field-accepted IED card/Command Dock UI ancestry; current #727/#729 integrated RC at 817c3910e8223fa2ac531a4426ada5d2d4bbbe50 retains the relevant code behavior. Original PR head d14a6e309326f8c22e2d812f9fff29bef719eb80 is an exact ancestor of the RC (GitHub compare ahead=807, behind=0).

Unique delta: Phase-1 Command Dock transparent expander header / operator-white glyphs. Evidence: All three non-production files are byte-identical in RC: docs/CHECKPOINT_COMMAND_DOCK_FAT_UI_PHASE1_2026-10-20.md, tests/ARSAS.Tests/MaterialIconConsistencyTests.cs, tests/ARSAS.Tests/P109XCommandDockWhiteGlyphRegressionTests.cs. The current App.xaml still defines CommandDockTransparentHeaderExpander and MainWindow.xaml still applies it to the original CommandPanelExpander. It keeps the original Expanded/Collapsed handlers and power SVG semantics. The original PR commit/branch remains recoverable, and original tests/checkpoints have not been deleted.

Safety: The current RC production files evolved after the PR, so we verified surviving specific behavior, not falsely claimed blob-identical entire XAML/model files. This action changes no runtime code, no main, no stable v1.6.42, no ARIEC engine pin and no R7/R10 or physical FAT policy.

Follow-up: Verify native glyph/chevron/operator visual acceptance under current GUI theme before any source promotion; #730/#732 remain active. Existing #649 and physically gated #729 remain OPEN. Do not revive/rebase older UI heads over current SSOT/Write/SMV.