feat: Galaxy v6 physics engine, graph scene overhaul, and ledger UI improvements #786

Job	Run time
core floor (numpy-only, Python 3.9)	3m 7s
coverage gate (Python 3.11)	5m 21s
browser accessibility smoke	1m 54s
build + install wheel	26s
core + backends typecheck (Python 3.11)	44s
test + lint (full offline stack) (3.12)	3m 22s
test + lint (full offline stack) (3.11)	3m 27s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	58s
repo hygiene gate (no stray DBs/logs)	6s
encryption driver gate (Python 3.13)	32s
docker smoke — path gate	7s
test + lint (full offline stack) (3.14)	3m 33s
encryption driver gate (Python 3.10)	47s
test + lint (full offline stack) (3.13)	3m 42s
test + lint (full offline stack) (3.10)	4m 8s
encryption driver gate (Python 3.11)	35s
encryption driver gate (Python 3.12)	37s
encryption driver gate (Python 3.14)	37s
Pi extension (windows-latest, Python 3.11, Node 24)	1m 56s
docker build + health smoke	1m 59s
	37m 58s

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