[trissim]

Surface G6 (receipt: docs/refactor/consolidation-20261009/G6-domain-blind-viewers.md). The napari and Fiji viewers no longer use OpenHCS's axis family. They lay out any stream from the axes that the stream declares.

Wire and layout

• The display config now carries declared_axes (DeclaredAxis: name, label, roles, value kind). Each viewer validates component_modes and component_order against the payload's own axes. The exact-set rejection in config.py is deleted. No viewer module reads AxisFamily.active() (guarded).
• Each viewer has a ViewerSlotFamily. NapariSlots are layer and stack. FijiSlots put colour in C, stack in Z, time in T, and anything else in FRAME, plus a window slot; axes that share a slot combine in declared order. NapariDimensionMode and FijiDimensionMode are derived from these families, keeping their member names so saved configs still load. The per-role field defaults also come from the slot family.
• The napari WELL→LAYER and fractional-Z cases now ask the declared axes for their role. Labels come from Axis.label, which the microscopy family sets to Ch, Z and T. ViewerAxisLabelStrategy is deleted. A named channel label now reads Ch 1: DNA (before: Ch1: DNA).
• The viewer decodes NapariDisplaySettings / FijiDisplaySettings, so openhcs.core.config is never imported in the viewer process.

Control: there is now one ViewerControlAction family. Each viewer inherits the lifecycle actions (shutdown, force-shutdown, clear-state, process-launch, settle) over a ViewerServerPort.

• Bug fixed: Fiji used to answer unknown messages with SUCCESS. Now one shared action answers ERROR, so navigate, viewport and measure sent to Fiji fail visibly.
• Both viewers advertise pong capabilities derived from the registry.
• The FijiUnsupported* plans are deleted.

Identity: each viewer is one ViewerFamily class (NapariViewer, FijiViewer) that owns its backend, config key, title, display settings (and so its slot family) and visualizer.

• ViewerType is now a boundary enum derived from that registry.
• Deleted: ViewerDeclarationABC and the forwarding properties on StreamingConfig and its mixin.
• start_viewer/stop_viewer are written once, in ManagedViewerLifecycleMixin.

Import cut: ExecutionConnectionProjection is renamed ExecutionConnectionFields and moved next to ExecutionConnectionSpec. The napari server now loads 75 openhcs modules instead of 203, with no microscopes, orchestrator or config (guarded).

Lockstep library PRs (not tagged; the lead releases): OpenHCSDev/ZMQRuntime#27 (0.5.0, deletes the flat ViewerComponentMode), OpenHCSDev/PolyStore#33 (0.4.0, receivers take window and layer components; requires zmqruntime 0.5) and OpenHCSDev/PyQT-reactive#17 (0.3.29, accepts zmqruntime <0.6). The pins are bumped here, and the submodule pointers point at those branches' commits.

Durable state: NapariVariableSizeHandling moved to openhcs.runtime.viewer_display. None of the owner's saved files reference it (checked by the lead), so no cutover tool is needed.

Rule 1b: Authority, admission and receipt names in the viewer modules are renamed (for example ViewerComponentCoordinateAuthority → ViewerComponentCoordinates and admit_settlement → request_settlement).

Tests: 37 viewer test files ran under -n 2 against a clean origin/main worktree. This branch introduces no failures beyond the baseline's 99. test_completed_shapes_publish_full_inventory_and_declared_domain fails only in the full-file run and passes alone; the same file fails 47 times on the baseline. A further 58 related files (agent, MCP, GUI, config, demos) show the same failures as the baseline after the fixes. New: guards (6), a witness in which a viewer under microscopy decodes a RemoteSensing stream and a family-level control test.

G6 · PR #1178 · guards 6/6 · production −1778 +1643 · tests −578 +886

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