Add native Google Sheets tools to repo agent

[Evanfeenstra]

What

Adds a native sheets_* tool family to repo/agent so agents can create Google Spreadsheets, build calculations with live formulas, and read computed results back:

• sheets_create_spreadsheet — creates via the Drive API inside the configured folder/shared drive (supportsAllDrives), so agent-created sheets are immediately visible to humans; supports extra tabs up front
• sheets_update_values / sheets_batch_update_values — USER_ENTERED writes, so strings starting with = become live formulas
• sheets_get_values — render: computed | formatted | formula for reading results or auditing formulas
• sheets_add_sheet — add a tab to an existing spreadsheet

How it's triggered

Mirrors the stakwork tools pattern: the family registers only when the caller supplies service-account credentials on the request body — never an LLM-visible parameter, never persisted to session config:

{
  "prompt": "build a mortgage comparison sheet with live formulas",
  "googleSheets": {
    "serviceAccount": { ...service account JSON (object, JSON string, or base64)... },
    "driveFolderId": "<shared folder or shared drive id>"
  }
}

toolsConfig can disable individual tools ("sheets_add_sheet": false) or override descriptions, same as everywhere else.

Implementation notes

• No new dependencies: auth is a plain service-account JWT flow (RS256 assertion via the existing jsonwebtoken, exchanged at token_uri), then straight REST calls with axios. Access token cached per agent run only, so different callers' credentials never mix.
• Handles the common credential paste bugs: object / JSON string / base64 input, literal \n in private keys.
• API failures and bad credentials return non-fatal "...failed: ..." strings to the agent.

Testing

• 10 unit tests (credential parsing, registration gating, per-tool overrides, graceful execute failure); full test:node suite passes (181 tests)
• Verified end-to-end against the real Google API: agent created a spreadsheet in a shared drive, wrote A1=2, A2=3, A3==A1+A2, and read back the computed 5

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