docs(adr): ADR 0006 — per-OS L3 backends + engines as opt-in cargo features#52
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…atures Captures the design decided 2026-06-25: extends ADR 0005 with HOW the L3 boundary is selected per OS and HOW brush becomes an opt-in alternative engine. D1 one cargo feature per backend (inert off its OS via target-cfg deps); D2 selection in code not the feature graph (enable-all + best_available_sandbox selector); D3 SandboxKind variant per backend, never overclaim (I9); D4 fail-closed apply so the reported kind reflects reality; D5 engines (incl. brush) opt-in behind the ADR 0005 seam, orthogonal to L3, additive+reversible. Cross-links #31/#35/#20/#28/#30 and the new macOS #50 / Windows #51 backend issues. macOS/Apple Silicon: builds clean + honest None until Seatbelt (#50) lands. Forward-pointer added to ADR 0005. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HMGPEApE4XfwgMhgFbRn6c
This was referenced Jun 25, 2026
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Captures the L3-by-OS-family + optional-brush design (extends ADR 0005). Docs only.
best_available_sandbox()), not the feature graph; enable-all +os-sandboxmeta-feature.SandboxKindvariant per backend; never overclaim (I9).apply()so the reported kind reflects reality.Cross-links #31/#35/#20/#28/#30 and the new macOS #50 (Seatbelt) / Windows #51 backends. Apple Silicon: builds clean + honest
Noneuntil #50 lands.🤖 Generated with Claude Code