fix: await async codec.compile in export_model

[nhjydywd]

Summary

export_model did not await codec.compile(). For async codecs (e.g. glTF),
the unresolved Promise was stringified as "{}".

Before: export_model(codec_id: "gltf") → content "{}"
After: same call → real glTF JSON (non-empty, includes asset.generator)

Sync codecs that already return strings continue to work via Promise.resolve.

Test plan

• bun run build + load dist/mcp.js
• glTF export no longer returns "{}"
• Spot-check a sync codec (e.g. obj) still exports

Summary by CodeRabbit

• Bug Fixes
  • Fixed model exports for codecs that compile asynchronously.
  • Exported content is now fully processed and serialized before completion.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: eccfdc9e-5748-40fa-a29e-8fd212ed7574

📥 Commits

Reviewing files that changed from the base of the PR and between 6b069e3 and cc8f05e.

📒 Files selected for processing (1)

• server/tools/export.ts

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Walkthrough

The export_model tool now supports codecs whose compile() method returns either a direct value or a Promise, resolving the result before output processing and serialization.

Changes

Export model codec handling

Layer / File(s)	Summary
Await codec compilation results server/tools/export.ts	The codec registry accepts synchronous or asynchronous compile() results, and export_model resolves both forms before processing output.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: jasonjgardner

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: awaiting async codec.compile in export_model.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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