Ruff comprehensions and performance

[cclauss]

Various list, dict, set comprehension, and performance improvements.

• https://docs.astral.sh/ruff/rules/#flake8-comprehensions-c4
• https://docs.astral.sh/ruff/rules/#perflint-perf

% ruff check --select=C4,PERF --statistics

61	C408   	[*] unnecessary-collection-call
57	C419   	[*] unnecessary-comprehension-in-call
50	C403   	[*] unnecessary-list-comprehension-set
23	PERF401	[ ] manual-list-comprehension
19	PERF203	[ ] try-except-in-loop
18	C401   	[*] unnecessary-generator-set
15	PERF102	[*] incorrect-dict-iterator
 9	C400   	[*] unnecessary-generator-list
 6	PERF402	[ ] manual-list-copy
 3	C405   	[*] unnecessary-literal-set
 2	C414   	[*] unnecessary-double-cast-or-process
 2	C416   	[*] unnecessary-comprehension
 1	PERF403	[ ] manual-dict-comprehension
[*] fixable with `ruff check --fix`

% ruff check --select=C4,PERF --fix --unsafe-fixes --output-format=concise

Found 265 errors (216 fixed, 49 remaining).