shard the test262 so we can run the whole thing - #119
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…ME refresh run-test262.mjs grows --shard K/N (the sorted test list partitioned so every runner agrees) and --cap-builtins all (the full built-ins tree, not the curated per-leaf cap). Selecting the whole suite is --stride-language 1 --cap-builtins all; report already recombines any concatenated jsonl. The workroot assembly (srcdir-tree + lib/generated + stage1 -> ./ejs) moves out of lane.sh into assemble-workroot.sh, shared by the lane and the new workflow. .github/workflows/test262-full.yml runs the entire suite sharded across parallel runners: one build job assembles and uploads the workroot, an N-way shard matrix runs slices against that one build, and a collect job concatenates the results and posts the report to the run summary. Report-only (not a gate — the curated lane stays the per-PR gate), macOS-only, nightly + workflow_dispatch with a tunable shard count. README: Language support rewritten to present-tense capability (classes/async-await/async generators/top-level await/BigInt/typed arrays/iterator helpers/..., ~75% test262, eval/ShadowRealm out of scope); dropped the stale "missing features" list and Date.prototype pin; removed the ld-warning note; added a conformance line to the intro. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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