feat: Galaxy v6 physics engine, graph scene overhaul, and ledger UI improvements #789

Job	Run time
coverage gate (Python 3.11)	5m 4s
core floor (numpy-only, Python 3.9)	3m 7s
repo hygiene gate (no stray DBs/logs)	7s
core + backends typecheck (Python 3.11)	50s
Pi extension (windows-latest, Python 3.11, Node 24)	2m 22s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	1m 5s
test + lint (full offline stack) (3.11)	2m 55s
test + lint (full offline stack) (3.12)	3m 34s
test + lint (full offline stack) (3.13)	3m 22s
test + lint (full offline stack) (3.14)	3m 21s
docker smoke — path gate	8s
test + lint (full offline stack) (3.10)	3m 45s
browser accessibility smoke	1m 53s
encryption driver gate (Python 3.12)	32s
encryption driver gate (Python 3.11)	35s
encryption driver gate (Python 3.13)	32s
encryption driver gate (Python 3.14)	35s
encryption driver gate (Python 3.10)	44s
build + install wheel	33s
docker build + health smoke	1m 43s
	36m 47s

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