feat(accounts): support Robinhood account selection

[jack-arturo]

Summary

• add robinhood_get_accounts so users can discover selectable Robinhood account numbers
• add optional account_number support to account-scoped portfolio, stock position, dividend, option position, and stock order-history tools
• document account selection and update registry metadata

Tests

• uv run --extra dev pytest -q
• uv run --extra dev ruff check .
• uv run --extra dev ruff format --check .
• git diff --check
• python3 -m json.tool server.json >/dev/null

Risk

• No trading APIs are exposed; this stays read-only. Account-specific stock holdings use Robinhood open positions directly because robin_stocks build_holdings() does not accept account_number.

[Copilot]

Pull request overview

Adds Robinhood multi-account support to the read-only MCP server: a new robinhood_get_accounts discovery tool and optional account_number parameters on portfolio, positions, single position, dividends, options positions, and stock order history. Account input is validated and forwarded to robin_stocks; the positions cache is now keyed per account; stock holdings for non-default accounts are constructed from get_open_stock_positions + quotes since build_holdings() does not accept an account.

Changes:

• New get_accounts() returning a slimmed account profile and the matching robinhood_get_accounts FastMCP tool.
• Account-aware tool layer: _normalize_account_number, _account_kwargs, per-account positions cache, _build_account_holdings, _matches_account dividend filtering.
• Documentation/registry updates (README account-selection section, server.json, CLAUDE.md tool count) and new tests for accounts, account forwarding, and per-account holdings.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/robinhood_mcp/tools.py	Adds get_accounts, account-number validation/forwarding, per-account positions cache, and account-specific holdings builder.
src/robinhood_mcp/server.py	Registers robinhood_get_accounts and threads optional account_number through the affected tool wrappers.
server.json	Adds registry entry for robinhood_get_accounts and notes optional account scoping on existing tools.
README.md	Documents the new tool and account-selection workflow.
CLAUDE.md	Updates the tool count from 14 to 15.
tests/test_tools.py	Adds tests for accounts listing, account-number normalization, per-account positions/dividends/options/order-history paths.
tests/test_server.py	Adds _call_tool helper and tests verifying server wrappers forward account_number.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.