Suggest object overrides in map files

[ViTeXFTW]

Summary

1. Suggest indexed objects while completing top-level Object names in map.ini and solo.ini
2. Keep new object names valid by treating this as completion-only
3. Add regression coverage for blank and partial Object headers

• Closes [Feature] Show existing objects in map.ini #64

Tests

• cargo test -p zerosyntax-analysis

[greptile-apps]

Greptile Summary

This PR adds workspace-backed Object-name completion for top-level Object headers in map.ini and solo.ini while preserving support for newly introduced object names.

• Adds an override-layer-specific completion context.
• Suggests indexed Object names as override targets.
• Adds regression coverage for blank, partial, and non-map Object headers.

Confidence Score: 4/5

The PR appears safe to merge, with one non-blocking completion-quality issue around presenting override-only objects as base override targets.

The new completion path is correctly limited to Object headers in map and solo files, but its unfiltered workspace lookup can produce misleading candidates.

Files Needing Attention: crates/analysis/src/completion.rs

Important Files Changed

Filename	Overview
crates/analysis/src/completion.rs	Adds map/solo Object-header completion and regression tests, but the candidate source also includes objects defined only in override layers and labels them as override targets.

_{Reviews (1): Last reviewed commit: "feat: suggest object overrides in map fi..." | Re-trigger Greptile}

[greptile-apps]

Override-only objects appear as targets

object_name_completions enumerates every indexed Object, including templates defined only in the current or another override layer, and labels each one as an override target. This makes the completion list misleading because those map-local templates have no base definition to override.

Knowledge Base Used:

• Semantic analysis services
• Completion and code actions

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!