mise recipe for benchmark baseline comparison and creation is broken

[RobertJacobsonCDC]

The mise recipes for the bench:create and bench:compare tasks are not expanding as expected. When invoking the task using key=value syntax (for example, name=sample baseline=main), the resulting command passed the literal strings "name=sample" and "baseline=main" to cargo bench, rather than just "sample" and "main".

The current task definitions look like this:

[tasks.'bench:create']
description = "Compare benchmarks against a Criterion baseline"
run = "cargo bench -p ixa-bench {{arg(name='name', default='')}} -- --save-baseline {{arg(name='baseline')}}"

[tasks.'bench:compare']
description = "Compare benchmarks against a Criterion baseline"
run = [
    "cargo bench -p ixa-bench {{arg(name='name', default='')}} -- --baseline {{arg(name='baseline')}}",
    "cargo run -q -p ixa-bench --bin check_criterion_regressions"
]

Running:

mise run bench:create name=sample baseline=main

expands to:

cargo bench -p ixa-bench 'name=sample' -- --save-baseline 'baseline=main'

and similarly for bench:compare. The intended behavior, however, is to run:

cargo bench -p ixa-bench 'sample' -- --save-baseline 'main'

The root cause appears to be that the tasks use {{arg(...)}} without defining explicit args. When arguments are supplied as key=value, mise treats them as literal positional strings rather than parsing them into named arguments, so the template receives the entire key=value text.

The fix is to define explicit task arguments and reference them directly. For example:

[tasks.'bench:create']
description = "Create a Criterion baseline"
args = [
  { name = "filter", optional = true },
  { name = "baseline" }
]
run = "cargo bench -p ixa-bench {{filter}} -- --save-baseline {{baseline}}"

[tasks.'bench:compare']
description = "Compare benchmarks against a Criterion baseline"
args = [
  { name = "filter", optional = true },
  { name = "baseline" }
]
run = [
  "cargo bench -p ixa-bench {{filter}} -- --baseline {{baseline}}",
  "cargo run -q -p ixa-bench --bin check_criterion_regressions"
]

With this change, the correct usage becomes:

mise run bench:create sampl main
mise run bench:compare sampl main

which expands to the intended Cargo commands.