Add FXList reference completions and diagnostics

[ViTeXFTW]

Summary

• Add reference-aware completions and diagnostics for FXList-related values, including FXList:-prefixed fields.
• Tighten suppression quick-fixes so they only apply to warnings and hints, not errors.
• Simplify and align analysis, diagnostics, and map-reference handling around the trimmed schema and value types.
• Update tests and docs to cover the new reference behavior and revised diagnostics model.

Testing

• cargo test -p zerosyntax-analysis --test spec
• cargo test -p zerosyntax-schema
• cargo test
• Not run: full server E2E / typing-latency checks

[greptile-apps]

Greptile Summary

Adds typed FXList asset references to the schema.

• Classifies Sound names as audio-event references.
• Classifies RayEffect and Tracer names as object references.
• Classifies ParticleSystem names as particle-system references.
• Extends analysis fixtures with completion and unresolved-reference coverage for each new reference type.

Confidence Score: 5/5

The PR appears safe to merge, with the schema mappings and focused reference-analysis fixtures consistently aligned.

The changed fields resolve through existing audio-event, object, and particle-system namespaces, and the added fixtures cover both successful completion and unresolved-reference behavior without exposing a concrete regression.

Files Needing Attention: The changed schema and reference-analysis fixtures are aligned.

T-Rex Logs

What T-Rex did

• The contract validation run completed successfully with exit code 0.
• The direct command output from the run was captured and retained in the fxlist-reference-spec-02-after.log artifact.
• The fxlist-reference-spec-02-after.log artifact is available for reviewer access via its URL.

_{Ran code and verified through T-Rex}

Important Files Changed

Filename	Overview
crates/schema/schema.json	Reclassifies four FXList fields as references to matching indexed declaration kinds; no actionable defect was identified.
crates/analysis/tests/spec/ReferenceTest.ini	Adds representative definitions, completion anchors, and unresolved FXList reference values.
crates/analysis/tests/spec/ReferenceTest.spec.toml	Adds matching completion and unresolved-reference expectations for all newly typed fields.

_{Reviews (1): Last reviewed commit: "Add FXList reference completions and dia..." | Re-trigger Greptile}