feat: Galaxy v6 physics engine, graph scene overhaul, and ledger UI improvements #855

Job	Run time
coverage gate (Python 3.11)	5m 11s
core + backends typecheck (Python 3.11)	36s
repo hygiene gate (no stray DBs/logs)	6s
encryption driver gate (Python 3.13)	37s
core floor (numpy-only, Python 3.9)	3m 1s
build + install wheel	29s
docker smoke — path gate	6s
encryption driver gate (Python 3.11)	33s
encryption driver gate (Python 3.10)	43s
encryption driver gate (Python 3.14)	34s
browser accessibility smoke	2m 32s
test + lint (full offline stack) (3.14)	3m 43s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	1m 0s
test + lint (full offline stack) (3.10)	3m 54s
test + lint (full offline stack) (3.11)	3m 7s
encryption driver gate (Python 3.12)	30s
test + lint (full offline stack) (3.13)	3m 32s
test + lint (full offline stack) (3.12)	3m 31s
Pi extension (windows-latest, Python 3.11, Node 24)	2m 0s
docker build + health smoke	1m 48s
	37m 33s

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