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fix(ERR-01): preserve raise and await source origins - #35
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Preconstructed exceptions now report their actual raise statement instead of their constructor. An exception rejected as a Promise value receives its first source-await origin; runtime/callback errors already raised retain their origin during propagation. Exception identity/message are preserved, and native explicit-raise tracebacks map back to the raise statement.
Validation: all 80 compiler/compatibility tests passed, including CPython differential raise/rejection/callback origins, shared-module errors, identity and native source-map traceback tests. Real Chrome 152 passed 13 integration checks, including preconstructed raise/rejection origins alongside the existing callback, Fetch, lifecycle, cancellation and example checks. Built wheel/source artifacts successfully. No runtime dependency or release change.
Closes #34.