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a94c9dc94e
`extractStruct` skips a struct with no body as a forward declaration. That is right for C/C++ (`struct Foo;`), but Rust has no forward declarations — `struct Unit;` is a complete unit struct. The type never entered the graph, and neither did anything attached to it: every `impl SomeTrait for Unit` lost its edge because the source endpoint did not exist. Brace and tuple structs were unaffected — both carry a body field (`field_declaration_list` / `ordered_field_declaration_list`), so only the unit form fell through. This is the same situation two earlier patches already handled, just a case each of them left uncovered: #831 hardcoded a carve-out for C# positional records — "complete definitions with no body block". #1093 introduced `skipBodilessClass` so a bodiless CLASS is kept unless a language opts into skipping it. Struct kept the unconditional skip. This adds `allowBodilessStruct`, the per-language opt-in for the struct side, and sets it for Rust only. The polarity is inverted relative to `skipBodilessClass` because the defaults differ — that is documented on both flags. The kernel's Rust walker had the same guard, placed before create_node, and its header listed the behavior as a mirrored bug-for-bug quirk. Node creation now happens first and the body is walked only when present, which is how extract_interface in the same file was already shaped. Kernel↔wasm parity is preserved (the parity suite compares the two, and passes). Four lines of logic across four source files; the rest is comments, docs and the two regression tests. The kernel header's quirk list, the parity suite's docstring and the R7b port checklist all documented the old behavior as intended, so each is updated — the checklist declares itself the living quirk reference for the walker, so a stale entry there would misinform the next reader. Effect on a real Rust/TS repository (2669 nodes): 13 structs and 9 implements edges recovered. Tests: two regression cases in extraction.test.ts. Verified failing without the fix on the wasm path (CODEGRAPH_KERNEL=0) and passing with it, on both the kernel and wasm paths. Full suite green — 170 files, 2922 tests. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>