[Clararosey67]

Closes #910

PR title

feat(pool): add investor position summary

Description

Summary

Add get_investor_position_summary(investor) to return an investor’s deposit positions, pending yield, and co-funding positions in one call.

Changes

• Return a per-token deposit entry for each token with a non-empty position or pending yield, including deposited value, available and deployed shares, earned amount, and pending claimable yield.
• Return a per-invoice co-funding entry with its token, principal share, and ownership in basis points.
• Calculate pending yield using the pool’s existing reward-per-share and loyalty-bonus rules.
• Add an integration test for deposit, yield, and co-funding summary data.
• Document the new entrypoint and response shape in interacting-with-contracts.md.

Validation

• git diff --check passed.
• Editor diagnostics reported no errors.

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