Streams aborts, ESM errors, and VFS fixes

Stream iter consumers now reject promptly on abort (b59def5)

Async stream consumers like bytes(), text(), arrayBuffer(), and array() now observe abort signals while waiting on a pending read, so they reject with the abort reason instead of stalling until the next batch arrives. The abort-aware iterator wrapper was also moved into shared stream/iter utils so pull paths and consumers use the same behavior.

merge() wakes and cleans up correctly on abort (b09d07d)

The multi-source merge consumer now wakes immediately when its abort signal fires, so pending reads reject instead of waiting for another source to settle. It also avoids awaiting iterator.return() cleanup when the primary failure is the abort reason, which matters for sources that may already be stuck in next().

ERR_REQUIRE_ASYNC_MODULE now carries better diagnostics (a006c5d)

Node.js restored and expanded metadata for async-module require() failures: the error now includes non-enumerable requireStack and topLevelAwaitLocations properties, and the message can name the required module explicitly. The docs were updated too, and the TLA-printing path now reports locations more clearly for users debugging require() of ESM with top-level await.

VFS memory files now treat -1 as current position (387332f)

MemoryFileHandle now recognizes -1 as the current-position sentinel for reads and writes, matching how fs.readSync() normalizes null positions. This fixes position handling across the VFS APIs and aligns the in-memory implementation with Node’s file-position semantics.

WHATWG streams got a hot-path performance pass (cc05d1c)

Readable and writable stream internals were refactored to cut per-chunk predicate overhead by collapsing several spec-state checks into single passes and caching state already known to be readable. The TransformStream backpressure promise is now created lazily, reducing allocation work when nobody is waiting.

Other misc changes

• Task runner shell-escaping fix for single quotes, with tests.
• Removed envinfo from CI/workflow jobs.
• Stream/webstreams refactor away from unnecessary optional chaining.
• Doc typo fix in CLI examples.