feat(zygon): visualize memory content flow

[sealuck]

Summary

• project Graph v5 memory evidence into layout-only writer-to-reader topology without exposing content dependencies as tensor I/O
• retain allocation Nodes in the source Graph while hiding them from the Model Explorer operation graph
• replace hidden allocation roots with a scrollable Storage legend named by root SSA; argument/global roots remain visible
• keep allocation and real user-input paths weakly colored by default, while leaving explicit parameter/buffer and global paths quiet until their legend item or member Node is selected
• suppress only explicit parameter/buffer and global memref SSA edges so lifted state does not turn the collapsed inputs group into a dense star; preserve user and unclassified MLIR inputs
• derive presentation-only Storage access order from viewer.graph_order; focused epoch gaps appear in a separate gray Storage access order overlay labelled next access (no content flow)
• use Alignment-Key source names in lowered labels such as sub_1 [linalg.generic] while retaining exact operation text in Node details
• carry explicit member Node IDs so a Storage with one visible access and no rendered edge remains selectable
• preserve the final writer-to-Model Output connection when the returned Storage allocation is hidden
• preserve structured DPS ins/outs roles, coalesced exact Views, collapsed-namespace projection, Output styling, current selection, and Buffer Focus
• publish ai-edge-model-explorer==0.1.32+zygon.7

Semantics

Colored content edges remain reaching-writer evidence. Access-order constraints only preserve the final MLIR artifact's straight-line Storage timeline across complete overwrites; they do not claim byte propagation or reconstruct Tensor SSA. Linked Tensor/Buffer graphs are tracked by sealuck/mlirdebugger#287.

Verification

• server/adapter Python tests: 40 passed
• ChromeHeadless UI tests: 63 passed
• production Angular build
• desktop Playwright inspection of the ResNet18 complete graph and expanded alloc_11 Focus
• canonical ResNet contract: 59 allocation paths plus one real user-input path visible, 102 on-demand parameter/buffer paths, exactly one ordinary input edge, and alloc_11 represented by 22 content plus 4 access-order edges
• companion clean-environment wheel installation and native regressions in sealuck/mlirdebugger#377

Companion change for sealuck/mlirdebugger#354.