feat(NO-TASK): Emit commit prefixes that pass linchpin commitlint

[aaronware]

Pairs with commitlint-config#8. Merge that one first.

The problem

Every prefix in this preset produced a commit that @linchpinagency/commitlint-config rejects. Across the org that is ~2,400 commits — none of them could ever satisfy the convention.

Two separate faults:

1. Invalid scopes — DEP, NPM, CMP, PLUGIN, THEME are not task keys. And deps / platform are not valid types at all.
2. The brackets broke the subject. headerPattern captures the subject from the first character it can take, so a leading [Project] / [WordPress] parsed to an empty subject — release-please would write blank changelog entries for these.

The change

The dependency kind moves into the scope, which is what the ecosystem already does (build(deps), chore(deps-dev)) and what commitlint-config now accepts. The bracket is dropped — the subject Renovate generates already says what was updated.

Before	After
build(DEP): [Project]	build(deps):
platform(DEP): [Project]	build(deps):
deps(NPM): [WordPress]	build(npm):
deps(CMP): [WordPress]	build(composer):
update(PLUGIN): [WordPress]	update(wp-plugin):
update(THEME): [WordPress]	update(wp-theme):

WordPress updates stay obvious at a glance, and are now greppable: git log --grep "^update(wp-plugin)".

wp-plugin / wp-theme match the package prefixes these rules already select on (wpackagist-plugin/**, wp-plugin/**), so they carry over to the wp-packages.org move.

Verification

All 19 prefixes remapped, no old form remains. Both preset files still parse, and every resulting message was linted through the real commitlint:

update(wp-plugin): Update dependency wpackagist-plugin/imsanity to v2.9.3   PASS
update(wp-theme):  Update dependency wpackagist-theme/twentytwentyfive to v1.3  PASS
build(npm):        Update dependency webpack to v5.94.0                     PASS
build(composer):   Update dependency humbug/php-scoper to v0.18.19          PASS
build(deps):       Update dependency npm-run-all2 to v9.0.3                 PASS
build(deps):       Lock file maintenance                                    PASS

commitBody templates were updated too, since they repeat the prefix once per upgrade.

Task: NO-TASK

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