feat(symfony): add events and Messenger intelligence

[sidux]

Summary

• read final Symfony event-listener wiring from generated container PHP without loading or executing it
• make publisher and subscriber attributes declarative through .phpantom.toml
• navigate events, messages, handlers, and Messenger buses across PHP and Symfony resources
• expose publisher → event → subscriber relationships through standard LSP Call Hierarchy nodes
• attribute publisher and listener metadata from configured transparent proxies to their real classes
• index Messenger class mappings for constant-time candidate lookup by class

Why

Event names and Messenger mappings are runtime/framework metadata spread across PHP attributes, service configuration, and the compiled container. Static container inspection recovers the final listener wiring without executing application code, while configurable attribute rules avoid hardcoding application packages. Canonical proxy ownership keeps navigation on real source classes, and synthetic event nodes preserve the standard editor Call Hierarchy experience instead of introducing a custom protocol.

Dependencies

• Depends on feat(symfony): add translation intelligence #401 for the preceding Symfony resource stack.
• Depends on feat(php): map transparent proxies to real classes #395 for the generic transparent-proxy relation.
• Depends on feat(php): add call hierarchy #413 for generic PHP Call Hierarchy.
• Uses the generic CodeLens foundation from feat(php): add scalable reference CodeLens #392.

Validation

• focused Symfony event, Messenger, proxy, and Call Hierarchy tests
• cargo clippy --fix --allow-dirty -- -D warnings
• cargo fmt
• cargo test --all-targets on the rebuilt Symfony head

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

❌ Patch coverage is 88.34039% with 633 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/code_lens.rs	87.98%	129 Missing ⚠️
src/symfony/container.rs	74.69%	104 Missing ⚠️
src/completion/symfony.rs	83.21%	93 Missing ⚠️
src/symfony/events.rs	93.54%	66 Missing ⚠️
src/indexing/watch.rs	47.78%	59 Missing ⚠️
src/rename/prepare.rs	58.57%	58 Missing ⚠️
src/proxy_metadata.rs	92.13%	25 Missing ⚠️
src/references/members.rs	94.62%	23 Missing ⚠️
src/references/dispatch.rs	74.68%	20 Missing ⚠️
src/reference_counts.rs	95.64%	18 Missing ⚠️
... and 8 more

📢 Thoughts on this report? Let us know!