feat(wasix): support direct Node execution

[f0rr0]

Summary

• honor execution: "direct" on Node while preserving "worker" as the default
• share one Node host/session bootstrap between direct and worker placement
• exercise direct/worker correctness, recovery, disposal, and directory persistence from the packed package
• qualify both Node placements independently against @electric-sql/pglite@0.5.4

Why

The original Node guard outlived the limitation that motivated it. The runtime can now execute in the caller realm, and an explicit direct placement should be an application choice: it trades worker isolation for lower per-call overhead and can block the caller's event loop. Directory storage keeps its main-thread requirement because its synchronous lease and recovery behavior is a storage constraint, not an execution-placement policy.

Performance evidence

Final commit: 504b40f192570fc13e8096facbb404be4a446f93

Matched Node placements, ten alternating fresh-process pairs per placement:

Placement	Geomean Oliphaunt/PGlite	Aggregate win	Gate
Worker	0.6175	38.25%	PASS
Direct	0.6219	37.81%	PASS

Both gates require <= 0.80 after correctness and PostgreSQL-settings parity. Direct is materially faster on startup, warm round trips, and indexed updates. Bulk insert and index creation remain slower than PGlite and are retained in the gate rather than excluded.

The browser qualification already merged into this stack in #134 remains unchanged: direct 0.5035 and worker 0.2029, with workload, durability, and WAL parity passing.

Validation

• moon run sdk-contracts:check oliphaunt-js:package oliphaunt-react-native:package oliphaunt-wasix-ts:package
• moon run oliphaunt-wasix-ts:bench
• packed Node smoke covering direct and worker placements plus cross-placement directory persistence
• WASIX TypeScript typecheck and unit tests: 19 files / 129 tests
• repository formatting policy and git diff --check
• exact clean-commit Node benchmark: worker 0.6175, direct 0.6219

Stacked onto the current head of #129 (f0rr0/wasix-sdk-clean-break).

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Project	Deployment	Actions	Updated (UTC)
oliphaunt-docs	Ready	Preview	Aug 13, 2026 10:37am