Zachary D. Rowitsch 9e0bbe37fc Add Test262 integration (Phase A): function properties, harness, 50 real tests ...

Add function property support to the JS engine (fn.prop = val, fn.prop,
fn.method()) enabling the Test262 assert harness pattern. Implement Test262
execution mode in the JS262 harness with simplified sta.js/assert.js shims.
Vendor 50 real tc39/test262 tests via curation script (35 pass, 15 known_fail).

Engine changes:
- JsObject: add Debug impl and has() method for presence checks
- JsFunction: add properties field (Rc-shared JsObject)
- Interpreter: handle function property get/set/call/compound-assign/update
  with user-property-over-builtin precedence

Harness changes:
- Add Test262 variant to Js262Mode with relaxed manifest validation
- Implement run_test262_case with harness prepending and error classification
- Create sta.js (Test262Error shim) and assert.js (assert.sameValue etc.)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-21 19:28:47 -05:00

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