feat: Galaxy v6 physics engine, graph scene overhaul, and ledger UI improvements #793

Job	Run time
coverage gate (Python 3.11)	5m 35s
core floor (numpy-only, Python 3.9)	2m 40s
repo hygiene gate (no stray DBs/logs)	4s
core + backends typecheck (Python 3.11)	46s
test + lint (full offline stack) (3.14)	3m 28s
browser accessibility smoke	2m 3s
test + lint (full offline stack) (3.12)	3m 55s
encryption driver gate (Python 3.10)	41s
build + install wheel	29s
test + lint (full offline stack) (3.13)	3m 30s
test + lint (full offline stack) (3.10)	3m 48s
test + lint (full offline stack) (3.11)	3m 15s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	54s
encryption driver gate (Python 3.12)	29s
encryption driver gate (Python 3.14)	44s
encryption driver gate (Python 3.11)	33s
Pi extension (windows-latest, Python 3.11, Node 24)	1m 53s
encryption driver gate (Python 3.13)	33s
docker smoke — path gate	9s
docker build + health smoke	1m 39s
	37m 8s

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