Add native kernel extensions on top of OCCT 8

[rifont]

Summary

• restore the Tau fork package identities while retaining the existing consumer import aliases
• add native OCCT Boolean batching with functional diagnostics and high-level fuseAll, cutAll, and intersectAll APIs
• expose serial/pthread runtime capabilities through the existing thread-pool configuration path
• add double-precision prototype tessellation, occurrence IDs, runtime-local partner identity, and deterministic prototype hashes
• keep bounded face/edge hashes as the unchanged public render-range contract, separate from prototype identity
• preserve OCCT transform locations and return usable Shape3D values from transformed sketch operations
• regenerate both committed WASM variants from the pinned Tau canary images, with all temporary telemetry and build provenance files removed

Scope

This is an internal Tau follow-up based on taucad/replicad:main after the OCCT 8 migration work for upstream PR sgenoud#263. It targets only taucad/replicad:main; it is not an upstream Replicad PR. It preserves fork work for Tau use and for any possible later, separately scoped upstream proposal.

Stable 3.0.0 OpenCascade.js artifacts are intentionally outside this PR. The committed artifacts use:

• ghcr.io/taucad/opencascade.js:canary-ebd263f1-single-threaded (sha256:215198af0e2ca4c5f308e5540869f2419784dc290062d3eb03d34e4f22e0188c)
• ghcr.io/taucad/opencascade.js:canary-ebd263f1-multi-threaded (sha256:5cb67064edc903ae50c254e32417da9662fa88ec2e734386c28a3806949862ce)

Verification

• frozen workspace install
• 16/16 direct single/pthread WASM tests
• byte-identical single/pthread TypeScript declaration surfaces
• Replicad typecheck, build, and 49/49 tests
• evaluator build and 4/4 tests
• CLI syntax check and 6/6 integration tests
• three.js helper build, studio lint/build, and app-example production build
• package tarball inspection: 11 intended OpenCascade/WASM files and 10 intended Replicad files; no telemetry, manifests, or provenance files

AI assistance

AI assistance: GPT-5 Codex was used to investigate, implement, test, and document these changes.

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