[TeoSlayer]

Carry the monotonic session start through live snapshots, final JSON, and reports so elapsed-time reporting uses the actual session origin. Append the optional snapshot field to preserve older array-encoded messages; missing timestamps keep the existing zero fallback. Refs #463.

Tests cover live, complete, interrupted, and older snapshots. Synced with upstream dependency/watchdog fixes, with session startup synchronized in the SIGINT test. Full Linux CI passes.

[github-actions]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #549   +/-   ##
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  Coverage        ?   82.66%           
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  Files           ?      170           
  Lines           ?    24334           
  Branches        ?        0           
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  Hits            ?    20115           
  Misses          ?     4219           
  Partials        ?        0           

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[TeoSlayer]

Verified session starts survive live/final snapshots and older snapshots remain readable. All CI checks pass.