ci: adopt fleet-standard PR check workflows on main

[remko48]

What

Syncs the PR check workflows from development to main, verbatim as they stand today:

• Replaced/added: code-quality.yml, pull-request-lint-check.yaml, branch-protection.yml, merge-hygiene.yml — copied unchanged from development.
• Removed: the legacy quality-check.yml, phpcs.yml, tests.yml, pull-request-quality-gate.yml, and pull-request-from-branch-check.yaml they superseded.

Why

#1113 aligned this repo's workflows with the fleet standard in ConductionNL/.github, but it merged into development only. PRs targeting main (every hotfix, e.g. #1313) still run the old inline quality workflow — a reduced check set on PHP 8.1 — instead of the shared quality suite, and don't report the check names the org ruleset expects.

Review notes

• Files are byte-identical to their development counterparts (including workflow fixes that landed after ci: align workflows with fleet standard (ConductionNL/.github) #1113), so the upcoming development → beta → main release merges resolve these files cleanly.
• Release workflows (*-release.yaml, release.yml) are intentionally untouched: swapping release automation is out of scope for this fix, and leaving them unchanged on main also merges cleanly later since only development modified them.

[github-actions]

Quality Report — ConductionNL/openconnector @ 42f834c

Check	PHP	Vue	Security	License	Tests
lint	✅
phpcs	❌
phpmd	✅
psalm	✅
phpstan	✅
phpmetrics	✅
eslint		✅
stylelint		✅
build		✅
build		✅
check-specs		❌
test-l10n		❌
format		❌
composer			❌	✅ 126/126
npm			❌	✅ 569/569
app:check-code	⏭️
info.xml	❌
REUSE	❌
PHPUnit					❌
Newman					❌
Playwright					❌
Hydra gates					❌

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Quality workflow — 2026-08-20 13:34 UTC

Download the full PDF report from the workflow artifacts.