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 keeps the existing PR scoped to one catalog entry plus the integrations index export. No duplicate Bilig PR or issue was opened.

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})) })"
git diff --check -- integrations/catalog/bilig-workpaper.json integrations/index.js
npm view @bilig/workpaper version
npm exec --yes --package @bilig/workpaper@latest -- bilig-evaluate --door agent-mcp --json

The local catalog import smoke printed:

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

Current public package proof:

• npm view @bilig/workpaper version returned 0.161.0
• npm exec --yes --package @bilig/workpaper@latest -- bilig-evaluate --door agent-mcp --json returned verified: true
• The evaluator reported @bilig/workpaper@0.161.0 and xlsx-formula-recalc@0.161.0
• It listed 8 MCP tools, edited Inputs!B3, changed expected ARR from 60000 to 96000, persisted the WorkPaper JSON, restored readback, and confirmed restart readback

Current Bilig source proof: proompteng/bilig@5a71e29818030e2251bc72bc2566ca18437c4e6d.

Earlier full local validation also passed python scripts/sync_extensions.py --check and uv run --group test pytest tests/ with 281 tests.