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Implement full strict mode directive prologue detection in parser and runtime enforcement in the VM. Tracks escape sequences in string tokens to correctly reject escaped directives. Enforces strict-mode reserved words, duplicate parameter names, delete-of-identifier errors, and undefined this binding for strict functions. Class bodies are implicitly strict. Promotes 13 Test262 tests from known_fail to pass. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>