Port JSC DOMJIT intrinsic stress corpus

Scope

Activate Bun’s byte-identical js/bun/jsc/domjit.test.ts corpus. It runs the original 1,000 / 10,000 / 100,000 / 1,000,000 iteration ladders across Buffer allocation, performance timing, TextEncoder/TextDecoder, crypto operations, filesystem Stats predicates, plus the million-iteration Node VM contexts.

Baseline

• native-todo wrapper: 0 passed, 0 failed, 0 unsupported, 1 todo
• corpus matches ~/Code/bun byte-for-byte

Acceptance criteria

• preserve all original iteration counts and VM-context loops
• support the real imported crypto/fs/vm modules and general crypto.timingSafeEqual byte validation/comparison behavior
• no reduced counts, skipped active tests, or fabricated stress results
• exact corpus passes all 46 active tests with 0 failures/unsupported; retain the 4 upstream-declared FFI todos
• add a permanent home_test regression
• full home_test gate passes
• commit/push as Chris Breuer without coauthors and update #66

Implemented and pushed in bb39dc5 (test: port Bun DOMJIT stress corpus).

What landed:

• activated the byte-identical upstream js/bun/jsc/domjit.test.ts
• retained the original 1,000 / 10,000 / 100,000 / 1,000,000 iteration ladders and the million-iteration VM-context loops
• added narrow static import lowering for the corpus’s existing bun:ffi, crypto, fs, and node:vm imports
• added a general crypto.timingSafeEqual implementation with byte-view type checks, equal-length validation, and a full-byte XOR comparison; no test-only return value
• added a permanent regression that pins both stress ladders, requires the native-todo wrapper to stay absent, and checks the exact upstream active/todo counts

Validation:

• corpus verified byte-identical with ~/Code/bun
• ./pantry/.bin/zig build debug --summary failures — pass
• exact corpus — 46 passed, 0 failed, 0 unsupported, 4 upstream-declared todos
• ./pantry/.bin/zig build test -Dfilter=home_test --summary failures — pass

Closing as complete. Tracking continues in #66.