docs(spec): stop quoting a corpus vector count

[jdx]

The argv grammar page quoted how many corpus vectors usage-lib agrees with. That count goes stale on every new vector file.

Agreement is already measured on each run (conformance/tests/reference.rs) rather than asserted in prose, so the page now says "every vector" instead of a number.

This comment was generated by Claude Code.

  

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Instruction counts

benchmark	trend	instructions	Δ	wall (min)	Δ
markdown	▁▁▂▂▄▂▁▂▂█	196,141,583 → 196,799,812	+0.34%	18.22 → 17.30ms	-5.02%
startup	█▄███████▁	829,332 → 825,005	-0.52%	0.84 → 0.86ms	+2.01%

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                      192       195       198       202  ns
argh: argv -> struct                          285       289       294       303  ns
clap: build tree + parse -> struct         485778    487396    490726    496982  ns
bpaf: build parser + parse -> struct      1604914   1604914   1612504   1631420  ns

usage: argv -> struct                             202 ns      0.20 µs
clap: build tree + parse -> struct             496881 ns    496.88 µs
clap: parse -> struct, tree reused              23481 ns     23.48 µs
clap: build tree only                          308240 ns    308.24 µs

_{d4b0747c7287 vs df69276f650a · measured on the runner, not pushed to the history.}