fix(cli): write strict JSON for MCP config

[catrielmuller]

Summary

• Normalize kilo.json after kilo mcp add so JSONC-preserved trailing commas are stripped for strict JSON config files.
• Preserve existing JSONC formatting for kilo.jsonc targets.
• Add regression coverage for remote OAuth MCP config output.

This fixes reports where adding an MCP server could leave kilo.json rejected by strict JSON parsers such as jq.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

The fix is correct and well-structured. KilocodeMcpConfig.format() is properly isolated in a Kilo-owned path, the single kilocode_change marker in the shared upstream file is minimal, and ConfigParse.jsonc is the right existing utility to strip trailing commas and comments before re-serializing as strict JSON. The test covers both the JSONC pass-through and the strict JSON normalization path with a realistic OAuth MCP config fixture.

Files Reviewed (4 files)

• .changeset/clean-mcp-json.md
• packages/opencode/src/cli/cmd/mcp.ts
• packages/opencode/src/kilocode/cli/cmd/mcp.ts
• packages/opencode/test/kilocode/cli/cmd/mcp.test.ts

Fix these issues in Kilo Cloud

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_{Reviewed by claude-4.6-sonnet-20260217 · 579,796 tokens}

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