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A BLAKE3 content-hash hit in extract_envelope_core returned the same
Ok(()) as a real import, so every import surface counted silently
skipped messages as successes and the documented duplicates field
stayed 0 forever.
Make the outcome explicit: extract_envelope_core now returns
ExtractOutcome::{Imported, Duplicate} and every import loop (batch
/import, upload EML, MBOX, PST) counts Duplicate into duplicates
instead of success. total = success + duplicates + failed holds on
every path; duplicates produce no failed_details entries and an
all-duplicates run reports Completed. The batch endpoint status check
treats duplicates as processed work so a duplicates-plus-failures run
keeps reporting Completed as before. The SMTP receiver and IMAP sync
ignore the outcome.