Add Bilig WorkPaper MCP catalog entry

[gregkonush]

Description

Adds Bilig WorkPaper to the OpenHands integrations catalog as a remote MCP server.

Bilig WorkPaper gives agents a spreadsheet-style formula workbook they can operate through tools: read inputs, set cells, recalculate, verify formula readback, and export JSON-backed state without driving Excel or a browser UI.

This refresh rebases the existing PR onto the current integrations/ catalog layout after the upstream MCP catalog rename. It keeps the change to one catalog entry plus the integrations index export.

Changes

• Add integrations/catalog/bilig-workpaper.json
• Register bilig-workpaper in integrations/index.js
• Use the current connectionOptions schema with unauthenticated Streamable HTTP transport

Validation

python3 -m json.tool integrations/catalog/bilig-workpaper.json >/dev/null
node --input-type=module -e "import('./integrations/index.js').then(m => { const x=m.INTEGRATION_CATALOG.find(i=>i.id==='bilig-workpaper'); if (!x) throw new Error('missing'); console.log(JSON.stringify({id:x.id,kind:x.kind,defaultConnectionOptionId:x.defaultConnectionOptionId,transport:x.connectionOptions[0].transport.kind,auth:x.connectionOptions[0].auth.strategy})) })"
python scripts/sync_extensions.py --check
git diff --check
uv run --group test pytest tests/

The import smoke printed:

{"id":"bilig-workpaper","kind":"mcp","defaultConnectionOptionId":"none","transport":"shttp","auth":"none"}

uv run --group test pytest tests/ passed 281 tests locally.