feat: Galaxy v6 physics engine, graph scene overhaul, and ledger UI improvements #856

Job	Run time
repo hygiene gate (no stray DBs/logs)	8s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	1m 0s
core + backends typecheck (Python 3.11)	40s
encryption driver gate (Python 3.13)	34s
encryption driver gate (Python 3.10)	36s
build + install wheel	25s
Pi extension (windows-latest, Python 3.11, Node 24)	2m 0s
test + lint (full offline stack) (3.14)	3m 42s
test + lint (full offline stack) (3.11)	3m 33s
core floor (numpy-only, Python 3.9)	3m 21s
docker smoke — path gate	6s
test + lint (full offline stack) (3.13)	3m 49s
test + lint (full offline stack) (3.10)	4m 0s
test + lint (full offline stack) (3.12)	3m 32s
coverage gate (Python 3.11)	5m 23s
encryption driver gate (Python 3.11)	39s
browser accessibility smoke	2m 41s
encryption driver gate (Python 3.14)	34s
encryption driver gate (Python 3.12)	30s
docker build + health smoke	1m 44s
	38m 57s

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