chore: point to toolset migration

.zig-cache/have-contract/a/alpha

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+#!/bin/sh
+echo ran >> .zig-cache/have-contract/ran

.zig-cache/have-contract/b/beta

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+#!/bin/sh
+echo ran >> .zig-cache/have-contract/ran

.zig-cache/have-contract/dup-a/dup

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+#!/bin/sh
+echo ran >> .zig-cache/have-contract/ran

.zig-cache/have-contract/dup-b/dup

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+#!/bin/sh
+echo ran >> .zig-cache/have-contract/ran

.zig-cache/have-contract/dup.out

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+dup

.zig-cache/have-contract/filter/dir-link

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+exec-dir

.zig-cache/have-contract/filter/not-exec

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+nope

.zig-cache/have-contract/help.out

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+usage: have [NAME...]
+
+List executable command names found in PATH, one per line.
+With NAME args, print the names that are available and exit 1 if any are missing.
+This inspects PATH only; it does not know shell builtins, aliases, functions, or packages.
+
+stdout:
+  one command name per line
+
+examples:
+  have | grep '^zig$'
+  have zig git curl

.zig-cache/have-contract/list.out

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+alpha
+beta

.zig-cache/have-contract/query.out

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+alpha