feat: Galaxy v6 physics engine, graph scene overhaul, and ledger UI improvements #808

Job	Run time
repo hygiene gate (no stray DBs/logs)	8s
core floor (numpy-only, Python 3.9)	3m 11s
coverage gate (Python 3.11)	5m 11s
docker smoke — path gate	14s
core + backends typecheck (Python 3.11)	36s
browser accessibility smoke	1m 57s
test + lint (full offline stack) (3.14)	3m 42s
encryption driver gate (Python 3.11)	28s
Pi extension (windows-latest, Python 3.11, Node 24)	2m 7s
build + install wheel	26s
test + lint (full offline stack) (3.12)	3m 45s
test + lint (full offline stack) (3.11)	3m 31s
encryption driver gate (Python 3.14)	40s
encryption driver gate (Python 3.13)	38s
encryption driver gate (Python 3.10)	32s
encryption driver gate (Python 3.12)	33s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	55s
test + lint (full offline stack) (3.10)	3m 22s
test + lint (full offline stack) (3.13)	3m 31s
docker build + health smoke	1m 45s
	37m 12s

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