chore(cache): improve invalidation logic

[sidux]

Automatic cache tags include the property or method name, with optional explicit prefixes. Cache reads and invalidations use the same tag builder. Cache misses and hits expose their keys and tags for diagnostics.

The current cache configuration and reserved-character sanitization are preserved. Traversal tracks object identity, so cyclic graphs terminate and objects sharing an identifier still contribute their other tags and children. Regression tests verify invalidation through the real Symfony tag-aware cache adapter.

Validation: Composer validation, ECS, PHPStan, and all 82 tests (308 assertions) pass. The repository's existing Nix inputs required temporary local overrides for validation; those overrides are not included in this PR.

Remaining rollout work:

• Add regression coverage for reserved tag characters, shared identifiers, and cyclic nested objects.
• Define a scoped cache-pool or namespace cutover for existing entries using the old tag format. Do not flush a shared Redis database.
• Verify nested-request behavior in a consuming application.
• Add coverage for cache-key invalidation when manual tag definitions change.

[github-actions]

Issued by Coverage Checker:

[sidux]

needs tests

[sidux]

needs test

[sidux]

needs test

[sidux]

needs tests

[sidux]

is there a possible embedded requests edge case ?