feat: Galaxy v6 physics engine, graph scene overhaul, and ledger UI improvements #768

Job	Run time
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	1m 1s
core floor (numpy-only, Python 3.9)	2m 32s
core + backends typecheck (Python 3.11)	44s
coverage gate (Python 3.11)	4m 57s
test + lint (full offline stack) (3.11)	3m 22s
Pi extension (windows-latest, Python 3.11, Node 24)	2m 11s
docker smoke — path gate	7s
browser accessibility smoke	1m 50s
test + lint (full offline stack) (3.12)	3m 21s
build + install wheel	22s
test + lint (full offline stack) (3.14)	3m 40s
encryption driver gate (Python 3.14)	41s
encryption driver gate (Python 3.10)	37s
test + lint (full offline stack) (3.13)	2m 54s
encryption driver gate (Python 3.11)	34s
repo hygiene gate (no stray DBs/logs)	5s
test + lint (full offline stack) (3.10)	3m 44s
encryption driver gate (Python 3.12)	35s
encryption driver gate (Python 3.13)	28s
docker build + health smoke	1m 42s
	35m 27s

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