perf(derive): drop proc-macro-crate transitive deps

[jdx]

Summary

Stacked on #1041. Drops proc-macro-crate (and its toml_edit / indexmap / winnow tree) from usage-derive so adopters compile a much smaller transitive set.

Approach

Keep rename / mixed-dependency resolution by reading the adopter’s Cargo.toml directly for the forms usage documents:

• bare keys (usage-argv = …)
• inline renames (usage = { package = "usage-rs", … })
• multi-line { … } tables
• [dependencies.foo] headers

Same priority as before: direct usage-argv wins, otherwise the usage-rs facade.

Tree

Before (under usage-rs): ~17 crates including toml_edit, winnow, indexmap, …

After:

• usage-rs → usage-argv + usage-derive
• usage-derive → syn / quote / proc-macro2 / unicode-ident

Checks

• cargo test -p usage-derive (including new crate_name unit tests)
• cargo test -p usage-rs (facade + cargo-alias + mixed-dependencies fixtures)
• cargo test -p usage-conformance --test derive --test unit_variants
• cargo clippy -p usage-derive --all-targets -- -D warnings
• cargo check -p usage-cli

Stack

• feat(lib): ship usage-rs as the one-crate rust default #1041 — one-crate facade defaults + release publish
• This PR — transitive dep cut

  

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[github-actions]

Instruction counts

benchmark	trend	instructions	Δ	wall (min)	Δ
markdown	▂▃▁▁▂▂▂▁▂███	196,871,114 → 196,903,399	+0.02%	17.79 → 18.73ms	+5.30%
startup	█████████▁▁▁	824,876 → 825,019	+0.02%	0.85 → 0.88ms	+3.10%

No instruction-count regression above 1%.

_{Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run.}

_{Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes.}

Shadow comparison

Parsing mise use -g node@20 against a shadow of mise's committed spec.
Reported, not gated: the shadow grows as the derive learns to express more, so
what to watch is the ratio rather than either column.

framework	instructions, cold parse	vs usage
usage	4220	—
argh	6292	1.5x
clap	5895248	1396x
bpaf	21917796	5193x

                                              min       p01       p10    median
usage-rs: argv -> struct                      198       202       205       209  ns
argh: argv -> struct                          296       303       310       316  ns
clap: build tree + parse -> struct         501814    504909    511427    519547  ns
bpaf: build parser + parse -> struct      1612349   1612349   1618650   1642586  ns

usage: argv -> struct                             215 ns      0.22 µs
clap: build tree + parse -> struct             507302 ns    507.30 µs
clap: parse -> struct, tree reused              23881 ns     23.88 µs
clap: build tree only                          309387 ns    309.39 µs

_{db26e1b4a493 vs 3236b06f3a4c · measured on the runner, not pushed to the history.}