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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>