test(coverage): lane 2 — sync, workers, transport & auth to >=95%
Test-only (zero production changes). Raises JVM unit-test LINE coverage
for the sync/worker, IMAP/SMTP/Graph transport, and OAuth packages:
data/sync 98.6%, mail 96.7%, auth 100.0% LINE.
New/extended cover:
- SendWorker outbox drain (SMTP/Graph, may-have-sent, SMTP fallback, staged
attachments), MailConnectionFactory token cache/refresh, MailSyncer.syncAll,
SendScheduler, MailBackfiller pre-existing-row refresh.
- ImapConnectionCache reuse + drop-retry, ImapClient fetchAttachment/setFlag/
deleteMessage/idle + edge cases, GraphSender.send transport.
- OutlookAuthManager token exchange/refresh + failure branches, OAuth models.
Instruction/branch coverage stays lower (coroutine suspend-state synthetics
under synchronous mocks) — a known JaCoCo x coroutines limitation, not
untested logic; JaCoCo config is untouched (owned by the capstone lane).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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