safety: STPA analysis of BA RFC #46 and cross-toolchain consistency#25
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safety: STPA analysis of BA RFC #46 and cross-toolchain consistency#25
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Add comparative STPA analysis of Bytecode Alliance RFC #46
("lower-component") against Meld's architecture:
- 5 RFC-specific losses, 6 hazards, 12 UCAs
- Gap analysis (6 RFC gaps Meld covers, 6 Meld gaps from RFC scope)
- Open questions mapped to hazards with recommendations
- Trust boundary comparison (Meld's smaller TCB vs RFC's host API)
Add cross-toolchain canonical ABI consistency analysis:
- 5 consistency hazards between Meld, Kiln, and Synth
- Shared wit-bindgen fixtures as executable conformance tests
- Coverage matrix tracking which tool paths are verified
Key findings:
- P3 scope blocked on upstream ecosystem tool availability, not Meld
- Host bindings (RFC's host-wit-bindgen) map to syn/kiln
- Multiply-instantiated modules is highest-priority shared gap (#24)
- Gale+Kiln form the runtime/OS stack; prepared for P3 threads/async
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
RFC #46 Analysis
The RFC proposes
lower-component(= Meld) +host-wit-bindgen(= syn/kiln) + Host C APIs. Key findings:Cross-Toolchain Consistency
5 consistency hazards (XH-1 through XH-5) where Meld, Kiln, and Synth must agree on canonical ABI layout. Shared wit-bindgen fixtures are the primary mitigation.
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