test(parity): bisect #1635 gap-bisect bundles — 3 pass, 2 split into #2277/#2278

[proggeramlug]

Summary

Bisected the 5 gap-bisect bundles filed against #1635:

Bundle	Verdict	Action
test_edge_regression	now byte-identical to Node	removed from skip-list
test_gap_array_methods	now byte-identical to Node	removed from skip-list
test_jsruntime_mixed_async_ordering_matrix	source file no longer exists in test-files/	removed from skip-list
test_edge_type_narrowing	single residual sub-case	retargeted to #2277
test_gap_class_advanced	single residual sub-case	retargeted to #2278

Residuals

• Union typeof-narrowing leaves array remainder mis-typed as string — .join → string method dispatch #2277: typeof === "string" narrowing on string | number[] leaves the else-branch mis-typed as string, so .join lowers as a string method and throws. The rest of the file (control-flow narrowing, discriminated-union dispatch, in-operator narrowing) passes.
• Static class block assigning true to a static boolean field reads back 0 (init missed) #2278: a static {} block assigning true to a declared static initialized: boolean reads back 0 instead of true. The rest of the advanced-class probes (private brand checks, decorator metadata, etc.) pass.

Net effect: three bundles cleared, two bundle entries downgraded from "fan-out gap-bisect" to "focused per-feature bug" (category bug-open).

Test plan

• cargo fmt --all -- --check clean (only a JSON edit).
• Each removed bundle verified BYTE-IDENTICAL to node --experimental-strip-types.
• Each residual entry's repro (in Union typeof-narrowing leaves array remainder mis-typed as string — .join → string method dispatch #2277 / Static class block assigning true to a static boolean field reads back 0 (init missed) #2278) reproduces only the single isolated sub-case noted.

Refs #1635.