fix(core): apply system-time snapshot to history when known_at is omitted #1172

Job	Run time
repo hygiene gate (no stray DBs/logs)	4s
test + lint (full offline stack) (3.10)	5m 9s
browser accessibility smoke	5m 8s
build + install wheel	25s
core + backends typecheck (Python 3.11)	41s
encryption driver gate (Python 3.14)	37s
encryption driver gate (Python 3.12)	32s
core floor (numpy-only, Python 3.9)	4m 28s
Pi extension (windows-latest, Python 3.11, Node 24)	1m 59s
test + lint (full offline stack) (3.12)	4m 52s
encryption driver gate (Python 3.11)	32s
encryption driver gate (Python 3.13)	32s
encryption driver gate (Python 3.10)	34s
coverage gate (Python 3.11)	6m 41s
test + lint (full offline stack) (3.11)	4m 39s
test + lint (full offline stack) (3.14)	3m 29s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	55s
docker smoke — path gate	7s
test + lint (full offline stack) (3.13)	4m 48s
docker build + health smoke	1m 49s
	48m 1s

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