fix(async): various

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optimization, documentation etc

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[Copilot]

Pull request overview

This PR focuses on optimizing async-signal memory/runtime behavior, tightening serialization semantics (including preserving explicit undefined and compacting object key encoding), and improving developer-facing error-code documentation and linking.

Changes:

• Refactors AsyncSignalImpl internals for lower memory overhead and adjusts polling / invalidation / abort handling, with corresponding unit test updates.
• Updates serdes to (a) preserve “must-serialize” undefined values via a sentinel and (b) encode short integer-like object keys as numbers; updates inflate safety rules and tests accordingly.
• Simplifies benchmark memory baselines format and adds new async-signal benchmark scenarios; adds docs for error codes and updates Vite source-file detection to include MD/MDX.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
scripts/validate-benchmark-memory.ts	Simplifies stored baseline format to a flat id -> bytes/instance map and updates validation logic accordingly.
packages/qwik/src/core/bench/bench-memory-results.json	Updates baseline JSON to the new flattened format and adds async-signal scenarios.
packages/qwik/src/core/bench/memory-scenarios.ts	Adds async-signal memory benchmark scenarios (default + concurrency).
packages/qwik/src/core/shared/serdes/constants.ts	Introduces explicitUndefined sentinel for serialization.
packages/qwik/src/core/shared/serdes/serialize.ts	Preserves required undefined values and encodes short integer-like plain-object keys as numbers.
packages/qwik/src/core/shared/serdes/inflate.ts	Allows numeric object keys during inflation and makes AsyncSignal inflation more optional/compact.
packages/qwik/src/core/shared/serdes/inflate.unit.ts	Updates unsafe-key handling tests to allow numeric keys.
packages/qwik/src/core/shared/serdes/serdes.unit.ts	Adds coverage for numeric key serialization and explicit-undefined async-signal serialization.
packages/qwik/src/core/shared/error/error.ts	Adds new error code (Q35) and changes production error-code links to point to docs.
packages/qwik/src/core/tests/use-async.spec.tsx	Updates expected error text for clientOnly async-signal .value access during SSR.
packages/qwik/src/core/reactive-primitives/types.ts	Adjusts AsyncCtx.info to optional and updates async-signal option docs.
packages/qwik/src/core/reactive-primitives/signal.public.ts	Adds untrackedLoading / untrackedError to the public AsyncSignal surface.
packages/qwik/src/core/reactive-primitives/impl/async-signal-impl.ts	Major internal refactor for memory savings + polling/invalidations + abort/error handling changes.
packages/qwik/src/core/reactive-primitives/impl/async-signal.unit.tsx	Updates and adds tests for polling semantics and AbortError behavior.
packages/qwik/src/core/qwik.core.api.md	Updates API surface to include untrackedLoading / untrackedError and removes deprecated option docs.
packages/qwik-vite/src/plugins/vite.ts	Treats .md/.mdx as source-like URLs for module selection logic.
packages/docs/src/routes/docs/menu.md	Adds “Error Codes” entry in docs navigation.
packages/docs/src/routes/docs/errors/index.mdx	Adds new error-codes reference page (Q0–Q35).
packages/docs/src/routes/docs/(qwik)/core/state/index.mdx	Expands useAsync$() documentation and documents new signal properties/options.
packages/docs/src/routes/api/qwik/index.mdx	Updates generated API docs to include untrackedLoading / untrackedError and clarifies option semantics.
packages/docs/src/routes/api/qwik/api.json	Updates generated API JSON content for the same AsyncSignal/Options doc changes.

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