Integrate 16 reviewed performance and usability PRs

Includes #8472 #8488 #9461 #9793 #9809 #9813 #9814 #9822 #9826 #9847 #9850 #9852 #9921 #9924 #9961 #10080 at reviewed heads.

Preserves each PR head as a parent. Reconciles CI workflow inputs and benchmark jobs without dropping checks. Excludes #8536 #9825 #9969 #10129. Combined CI pending; no manual validation claimed.
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@@ -5295,6 +5295,7 @@ dependencies = [
"photocraft-geom",
"photocraft-raster",
"rayon",
"rustc-hash 2.1.3",
"serde",
"serde_json",
]