fix(wp-cli): route @alias SSH commands to the vendored wp-cli

[oxyc]

Standardises config/wp-cli/pre-ssh.php so wp @alias SSH commands route to the vendored wp-cli on the remote instead of falling back to a global, outdated one.

Two bugs this addresses (your repo had at least one):

1. The Symfony\\Component\\Yaml\\Yaml + class_exists() variant is silently skipped in the wp-cli runtime (the class isn't autoloadable there), so <release>/vendor/bin is never prepended to the remote $PATH.
2. wp-cli 2.13+ exposes $runner->alias without its leading @ (production vs @production), so the alias lookup in wp-cli.yml misses and the hook bails before exporting WP_CLI_SSH_PRE_CMD.

When the vendored path is dropped, the remote uses a global wp-cli whose bundled symfony/console clashes with Acorn's illuminate/console v13:

Declaration of Illuminate\\Console\\Command::setHidden(...): static must be
compatible with Symfony\\Component\\Console\\Command\\Command::setHidden()

The fix uses wp-cli's bundled Spyc parser and normalises the alias key, so it works on old and new wp-cli. Verified in generoi/suomentyokalu#409.

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