test(code-splitting): pin flag-off wrapped-esm init emission

[hyfdev]

Summary

Adds three executable flag-off regression fixtures for wrapped-ESM init emission changes that landed with #10104. None enables strictExecutionOrder, and this PR changes no production source.

The earlier version of this PR required each barrel directly, which wrapped the immediate importee and bypassed the shared init-target collector it claimed to cover. The two collector fixtures now keep the immediate barrel at WrapKind::None in a shared chunk, while later require() calls wrap the leaf owners and make their init symbols reachable from the main chunk.

Coverage

Importer-local namespace liveness

namespace_liveness_gating imports the barrel namespace but reads only ns.a(). A second entry places the unwrapped barrel in a shared chunk; later requires make both wrapped leaf init symbols reachable.

• Current output emits only init_leaf_a() at the namespace-import position. init_leaf_b() stays at its later explicit require position.
• Pre-feat(code-splitting): wrap strict execution order modules on demand #10104 output emitted init_leaf_a(), init_leaf_b() together at the namespace-import position.
• The shared barrel still evaluates both leaves exactly once; runtime order is A, B, BEFORE_REQUIRE:a, MAIN.

Sorted, non-ambiguous star-export routing

ambiguous_star_reexport has two wrapped leaves that both export x. The entry uses a real export * from record; a dynamic CommonJS re-export keeps that record included, while the second entry keeps the immediate barrel unwrapped and in another chunk.

• Current output excludes ambiguous x from the collector's sorted, non-ambiguous export map and emits no owner init before __reExport(...).
• Pre-feat(code-splitting): wrap strict execution order modules on demand #10104 output selected an ambiguous owner and emitted init_mod_a() before __reExport(...).
• Runtime confirms x is absent and both owners still evaluate exactly once through the shared barrel.

Excluded re-export to a TLA wrapper

excluded_reexport_tla uses codeSplitting: false, so an inline dynamic import wraps the barrel and its static dependency chain even with strict execution order disabled. With moduleSideEffects: false, the carrier's unused re-export is excluded while the same TLA leaf remains live through a separate used import.

• Current output emits await init_leaf() in the carrier's async wrapper before its later statement.
• Pre-feat(code-splitting): wrap strict execution order modules on demand #10104 output emitted bare init_leaf(), producing CARRIER:undefined before the leaf's top-level await completed.
• Current runtime order is LEAF:before, LEAF:after, CARRIER:ready, BARREL:used:marker.

Behavior / snapshot impact

Tests only: two existing fixtures are corrected, one TLA fixture is added, and their generated snapshots are pinned. No existing production code or unrelated snapshot changes.

Validation

• Rebased onto main at cccf1d0d849c71e80c02fe3ff17a97192f3bf258.

• Generated all three fixtures with the macOS native binding from current-main CI run 29795703407; every _test.mjs passed under Node.

• Compared each committed snapshot byte-for-byte with those generated assets after applying the integration harness's runtime-module hiding.

• Re-ran the same sources with the pre-feat(code-splitting): wrap strict execution order modules on demand #10104 binding from CI run 29559371389: both collector fixtures show the obsolete extra init, and the TLA fixture logs CARRIER:undefined.

• vp fmt ... --check, typos, JS syntax checks, JSON parsing, and git diff --check pass. The pre-commit vp check --fix hook also completed cleanly.

• CI run 29819995357: Repo, Rust, Node, Cargo, WASI, native-build, and Node 20/22/24 test jobs passed. Vite Test Ubuntu and the three Ubuntu Dev Server jobs stopped before tests because the Vite rolldown-canary branch no longer rebases cleanly onto vite/main (pnpm-lock.yaml conflict); this is unrelated Vite checkout noise.

AI usage disclosure

Per the AI Usage Policy, OpenAI Codex was used to rebase and review the PR, design the corrected regression shapes, and verify generated output. I reviewed the final diff and validation evidence.

---

Follow-up to #10104; addresses Major 2b/2c from the review discussion: #10104 (comment)

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[hyfdev]

Merge activity

• Jul 21, 1:36 PM UTC: The merge label 'graphite: merge-when-ready' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Jul 21, 1:36 PM UTC: hyfdev added this pull request to the Graphite merge queue.
• Jul 21, 1:42 PM UTC: Merged by the Graphite merge queue.