Add base leg valuation for synthetic perp markets in Drift adapter

[zknpr]

This PR addresses the issue where base leg valuation was skipped for perp markets lacking a spot mint (e.g., HYPE-PERP).

Changes:

• In projects/neutral-trade/utils/drift.js, within getTvl, modified the perpPositions processing loop.
• Added logic to the else block (where baseTokenMint is missing) to fetch the PerpMarket account info.
• Implemented parsing of last_oracle_price from the HistoricalOracleData struct within the PerpMarket account (specifically at offset 72).
• Calculated the USD value of the base position using the formula: (base_asset_amount * last_oracle_price) / 1e9. The division by 1e9 accounts for the base asset precision (1e9) and oracle price precision (1e6) to produce a result in USDC precision (1e6).
• The calculated value is added to the USDC balance using api.add.

This ensures that the TVL/Equity calculation correctly includes the value of positions in synthetic perp markets. Verified via a temporary test script mocking the buffer read and calculation.

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PR created automatically by Jules for task 864869628374530130 started by @zknpr

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📥 Commits

Reviewing files that changed from the base of the PR and between 2d20682 and 1ddfbf9.

📒 Files selected for processing (1)

• projects/neutral-trade/utils/drift.js

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch drift-base-leg-valuation-864869628374530130

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[zknpr]

Closing: duplicate of PR #73 (drift base leg pricing). #73 has better comments explaining precision and includes null checks.

[google-labs-jules]

Closing: duplicate of PR #73 (drift base leg pricing). #73 has better comments explaining precision and includes null checks.

Understood. Acknowledging that this work is a duplicate of PR #73 and stopping work on this task.