Rust Phase 4 schematic compiler exit audit

Status: accepted after independent review of bd168c7. Phase 4 is complete. This audit evaluates the native schematic compiler boundary only; plotter/text closure and the native kicad-cruncher command remain later plan phases.

Accepted project corpus

The complete accepted Phase 4 project corpus is the following mandatory, restored set. Rack L3_020 resolves every case through the package-local corpus manifest and fails rather than skips if a case is unavailable.

Plan-bullet evidence

Phase 4 obligationDurable implementation and evidenceDisposition
Project bundles, hierarchy discovery, occurrence realization, connectivity, and bus expansion rust-source-bundle-phase4-slice.html and rust-schematic-connectivity-phase4-slice.html; schematic_bundle, connectivity, bus, bus-connectivity, design, and netlist Rust tests; complete Python differential in Rack L3_020. Closed
Compiled graph TypeSpec authority, deterministic identity allocator, validator, and compiler rust-compiled-schematic-graph-phase4-contract.html and rust-compiled-schematic-graph-phase4-native.html; generated contract tests, shared identity vectors, Rust compiled_graph_producer/compiled_graph_semantics, and Rack L0_050. Closed
Native netlist model and serialization rust-netlist-phase4-slice.html; kicad_netlist Rust tests and Rack L3_020 compare the governed version-E projection and parsed version-E output against Python for all four accepted projects. Closed for the explicitly governed version-E surface
Single-page, hierarchy, repeated-page, multipart, scalar/global/bus binding, DNP/off-board, and malformed cases Source-bundle, effective-symbol, terminal, occurrence-local net, scalar-design, bus-promotion, compiled-graph producer, and netlist tests cover the positive cells. Shared semantic-failure vectors plus Rust graph validation cover invalid identity, duplicate identity, inverse ownership, reference closure, role payload, graphical target, and hierarchy-cycle failures. Closed

Reader and writer closure

Source familyRequired evidenceLatest exit run
Schematic Rack L1_032 requires every durable schematic, exact owned write, equal reparsed typed state, stable second write, transactional mutation, limits/I/O diagnostics, and Python mutation semantics. The accepted exit run also used an installed schematic-capable KiCad CLI oracle; ongoing L1_032 CLI coverage is optional when no capable executable is available. 5 passed
Standalone symbol library Rack L1_028 and symbol_library_typed_slice cover every promoted summary field, exact source preservation, replacement/insertion, semantic reparse, stable second write, ambiguity, and resource failure. A complete owned graphical symbol model is not promoted by Phase 4 and is not implied by this gate. 2 Rack tests and 4 focused Rust tests passed
Worksheet Rack L1_033 compares all five durable modern/legacy worksheets with Python, requires exact first and stable second writes, and covers bounded mutation, bitmap variants, and I/O failures. 3 passed
Project Rack L1_034 requires all 217 restored project files, exact writes, stable canonical writes, full canonical hash parity, promoted typed fields, direct Python mutation parity, and resource/I/O failures. 3 passed

Exit-gate result

Rack L3_020 compares the entire generated a0 compiled graph exactly with Python for each accepted project. It separately compares the documented version-E netlist projection exactly and compares emitted KiCad netlists as parsed semantic trees. Synthetic cases add alias-only and reordered bus boundaries, distinct UUID-less sheet-pin identities, and project-controlled multipart naming.

No native schematic, standalone symbol-library, worksheet, project, or malformed compiled-graph cell identified by the Phase 4 plan remains open. Text shaping/outlining, schematic and PCB plotter-IR closure, complete native command packaging, and downstream interchange models are explicitly owned by later plan steps and do not widen this exit gate.