add E2 era-probe and E1b URL-heuristic results

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restore month-from-text fine-granularity probe with retained month labels

fix: register dynamically-loaded module in sys.modules before exec_module; clean E1b URL-year counting

add E2 era-classification probe script

add E1 results and the fetch-vs-authorship finding

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add E1 audit script (validated in sandbox quick mode)

add unit tests (validated in sandbox, 8/8 pass)

add temporal_keys package (validated)

add README for E1 temporal-provenance audit

initial commit