[prgTW]

Problem

• On Symfony 4.4, cache_tags:invalidate logs a deprecation because execute() returns null.
• On Symfony 5 and 6 the bundle does not run: the listeners type-hint the removed Filter*Event classes, setDeprecated() needs 3 arguments on 6.x, and MASTER_REQUEST is gone. composer.json does not allow those versions.
• The bundle loads YAML config but does not require symfony/yaml.
• There are no tests and no CI.

Solution

• execute() returns 0.
• Listener arguments are untyped; the response listener uses isMainRequest() when available.
• host_header uses the 3-argument setDeprecated() on Symfony 5.1+.
• Symfony constraints gain ^5.0 || ^6.0; symfony/yaml is required.
• A PHPUnit suite: a kernel/container smoke test (FrameworkBundle, SensioFrameworkExtraBundle and this bundle, two Varnish proxies, one with host_header), the controller listener with @CacheTag\Plain, the X-CACHE-TAGS response header, cache_tags:invalidate against a fake local endpoint, and the Configuration tree.
• A GitHub Actions matrix (below). Symfony 7 is not included: sensio/framework-extra-bundle, a hard requirement, does not support it.

Behaviour

No change to the bundle's behaviour. The tests and CI are additive (dev dependencies and tests/ only).

Verification

All 14 CI legs pass (Symfony / PHP):

• 3.4: 7.4, 8.1
• 4.4: 7.4, 8.0, 8.3
• 4.4, lowest dependencies: 7.4
• 5.4: 7.4, 8.0, 8.2, 8.4
• 6.4: 8.1, 8.2, 8.3, 8.4

Suggested release: v2.0.0.