Rename Mercury autocomplete model labels

[chrarnoldus]

Summary

• Rename Mercury autocomplete labels to distinguish FIM and Next Edit modes.
• Keep VS Code settings descriptions aligned with the selector labels.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Overview

This update is a clean naming pass that renames labels consistently across all files:

• Mercury Edit 2 → Mercury Edit 2 (FIM) for the FIM completion model
• Mercury Next Edit → Mercury Edit 2 (Next Edit) for the next-edit model

The branch was rebased since the previous review. The current single commit (2d7c49d) contains all the changes and has been reviewed in full. All changes are consistent and correct. The previous double-parentheses issue in package.json is resolved (comma-separated form used instead).

Files Reviewed (3 files)

• .changeset/rename-mercury-autocomplete-labels.md — changeset added for user-facing rename
• packages/kilo-gateway/src/autocomplete.ts — labels and comment updated to reflect new model names consistently for both Kilo and Inception providers
• packages/kilo-vscode/package.json — enumDescriptions updated; previous double-parentheses issue resolved (comma-separated form now used)

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_{Reviewed by claude-4.6-sonnet-20260217 · 220,838 tokens}

_{Review guidance: REVIEW.md from base branch main}