peerigon / typescript-toolkit / 30963514774

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feat(error): add namespaced, serializable error domains (#7)

Adds a new `error` sub-export for defining error classes: domains are
classes (so `instanceof` works against a whole domain, not just one
error), error codes are namespaced via the existing `namespace` module,
context merges domain defaults -> per-error defaults -> runtime context,
and errors round-trip through JSON via `toJSON()`/`errors.parse()` with
an `UnknownError` fallback for unregistered codes. Stack serialization
defaults to `isDev` (new `src/lib/is-dev.ts` helper) and is configurable
globally or per call.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

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