chore: bump rust toolchain to 1.88.0

[art049]

Summary

• Bump Rust toolchain from 1.80.0 to 1.88.0
• Fix all clippy warnings that arose from the new toolchain version
• Update code to use inline format variables as required by clippy::uninlined-format-args

Changes

• Updated rust-toolchain.toml to specify version 1.88.0
• Fixed ~10 instances of format string warnings across multiple crates
• Replaced std::ptr::fn_addr_eq with pointer casting to maintain MSRV compatibility

Test plan

• All pre-commit hooks pass
• cargo fmt --all runs successfully
• cargo clippy --all-targets --all-features -- -D warnings passes

🤖 Generated with Claude Code

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #104 will degrade performances by 36.24%

_{Comparing fix-pre-commit-errors (96317b0) with main (d78ae4a)}

Summary

⚡ 17 improvements
❌ 25 regressions
✅ 125 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	a	281.4 ns	310.6 ns	-9.39%
❌	a	281.4 ns	310.3 ns	-9.31%
⚡	fibo_iterative	156.1 ns	126.9 ns	+22.98%
⚡	sum_fold	283.9 ns	254.7 ns	+11.45%
❌	Iterative	103.6 ns	162.5 ns	-36.24%
❌	Iterative[20]	103.6 ns	162.5 ns	-36.24%
❌	Iterative[21]	105.3 ns	164.2 ns	-35.87%
❌	sleep_100ms	595.3 ns	624.4 ns	-4.67%
❌	sleep_10ms	566.1 ns	595.3 ns	-4.9%
❌	sleep_1ms	566.1 ns	595.3 ns	-4.9%
❌	sleep_50ms	566.1 ns	595.3 ns	-4.9%
⚡	bench_array1[10]	254.2 ns	195.8 ns	+29.79%
⚡	bench_array1[1]	119.2 ns	90 ns	+32.41%
⚡	bench_array2[10]	254.2 ns	195.8 ns	+29.79%
⚡	bench_array2[1]	119.2 ns	90 ns	+32.41%
⚡	init_array[1000]	9.4 µs	9.1 µs	+3.38%
❌	fibo_50	90.3 ns	119.4 ns	-24.42%
⚡	div	124.2 ns	95 ns	+30.7%
⚡	recursive[0]	240.3 ns	211.1 ns	+13.82%
⚡	recursive[5]	320.3 ns	291.1 ns	+10.02%
...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #104 will degrade performances by 57.78%

_{Comparing fix-pre-commit-errors (474990b) with main (07d226e)}

Summary

⚡ 27 improvements
❌ 22 regressions
✅ 105 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	Recursive	52.4 µs	50.4 µs	+4.02%
⚡	Recursive[20]	52.3 µs	50.4 µs	+3.95%
⚡	Recursive[21]	84.7 µs	81.5 µs	+3.93%
⚡	fibonacci_custom_measurement	421 ns	380 ns	+10.79%
⚡	large_drop	178.9 µs	170.3 µs	+5.01%
❌	large_setup	11 ns	13 ns	-15.38%
⚡	from_elem[16384]	852 ns	818 ns	+4.16%
⚡	from_elem[2048]	255 ns	232 ns	+9.91%
⚡	from_elem[4096]	329 ns	317 ns	+3.79%
❌	init_array[1000]	1.8 µs	2.1 µs	-14.46%
❌	print_env_hello	1.9 µs	2.2 µs	-11.67%
❌	iterative[5]	7 ns	8 ns	-12.5%
⚡	recursive[0]	2 ns	1 ns	×2
⚡	recursive_memoized[BTreeMap<u64, u64>, 0]	17 ns	14 ns	+21.43%
❌	recursive_memoized[BTreeMap<u64, u64>, 10]	516 ns	585 ns	-11.79%
❌	recursive_memoized[BTreeMap<u64, u64>, 20]	1.7 µs	1.9 µs	-8.02%
❌	recursive_memoized[BTreeMap<u64, u64>, 5]	182 ns	232 ns	-21.55%
❌	recursive_memoized[HashMap<u64, u64>, 0]	15 ns	16 ns	-6.25%
❌	recursive_memoized[HashMap<u64, u64>, 10]	1.5 µs	1.6 µs	-3.19%
⚡	sort_unstable	130.5 µs	109.7 µs	+18.95%
...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.