feat: add Mapbox Tiling Service (MTS) tools

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## Summary

Add MTS tools so agents can take raw data (GeoJSON, CSV, etc.) all the way through to a published tileset that can be referenced in a style layer — entirely within the devkit.

## Why DevKit

MTS is a data-pipeline / developer workflow operation, not a runtime geospatial computation. It belongs alongside the existing style and token management tools rather than in the mainline geo-computation MCP server.

## Proposed Tools

| Tool | MTS / Uploads API endpoint | Description |
|---|---|---|
| `upload_tileset_source_tool` | `POST /tilesets/v1/sources/{username}/{id}` | Upload a GeoJSON or CSV file as a tileset source |
| `create_tileset_tool` | `POST /tilesets/v1/{tileset_id}` | Create a tileset with a recipe |
| `publish_tileset_tool` | `POST /tilesets/v1/{tileset_id}/publish` | Kick off the tiling job |
| `get_tileset_status_tool` | `GET /tilesets/v1/{tileset_id}/jobs/{job_id}` | Poll job status (queued / processing / success / failed) |
| `list_tilesets_tool` | `GET /tilesets/v1/{username}` | List tilesets for the authenticated user |

## Agent Workflow This Enables

```
1. upload_tileset_source_tool — POST GeoJSON/CSV → get source_id
2. create_tileset_tool — define tileset + recipe referencing source_id
3. publish_tileset_tool — kick off tiling job → get job_id
4. get_tileset_status_tool — poll until status === "success"
5. update_style_tool (exists) — add a layer referencing the new tileset
```

This gives an agent a complete "I have data, build me a map" loop without leaving the devkit.

## Token Scopes Required

- `tilesets:write` — create, update, publish tilesets
- `tilesets:read` — list, status
- `tilesets:list` — list tilesets

## References

- [Mapbox Tiling Service API docs](https://docs.mapbox.com/api/maps/mapbox-tiling-service/)
- [Uploads API docs](https://docs.mapbox.com/api/maps/uploads/)

Start with the Mapbox Tiling Service and Uploads API references linked in the issue, then trace how existing style and token management tools are structured in the devkit. Implement and verify the five proposed tools across upload, creation, publishing, status polling, and listing, with the required token scopes and the documented agent workflow working end to end.

Written by the indexing model from the issue text.