feat: Galaxy v6 physics engine, graph scene overhaul, and ledger UI improvements #826

Job	Run time
core floor (numpy-only, Python 3.9)	2m 33s
repo hygiene gate (no stray DBs/logs)	8s
core + backends typecheck (Python 3.11)	42s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	58s
coverage gate (Python 3.11)	5m 21s
docker smoke — path gate	9s
Pi extension (windows-latest, Python 3.11, Node 24)	3m 10s
test + lint (full offline stack) (3.12)	3m 25s
build + install wheel	22s
encryption driver gate (Python 3.14)	37s
encryption driver gate (Python 3.11)	26s
encryption driver gate (Python 3.13)	29s
encryption driver gate (Python 3.12)	28s
encryption driver gate (Python 3.10)	35s
test + lint (full offline stack) (3.11)	3m 14s
test + lint (full offline stack) (3.10)	4m 6s
test + lint (full offline stack) (3.13)	3m 46s
test + lint (full offline stack) (3.14)	3m 41s
browser accessibility smoke	2m 1s
docker build + health smoke	2m 0s
	38m 11s

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