Add defi/vault-strategy anchor program with mock swap router#42
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…e and rebalancing Adds a new example under defi/vault-strategy/anchor demonstrating a manager-custodial investment vault on Solana. ## What this adds ### vault-strategy program - `initialize_strategy` — creates the Strategy PDA, share mint, and vault ATAs for USDC/TSLAx/NVDAx; registers Pyth price feed pubkeys - `deposit` — accepts USDC, prices shares against Pyth-computed NAV, mints proportional LP shares to the depositor - `invest` — manager-only CPI to the swap router to convert USDC into basket tokens (TSLAx or NVDAx) - `rebalance` — manager-only atomic two-leg CPI: sell one basket token for USDC then buy the other, with slippage protection on both legs - `collect_fees` — permissionless; accrues the annual management fee by minting new shares to the manager (dilution model) - `withdraw` — burns shares, returns proportional in-kind slice of every vault asset (USDC + TSLAx + NVDAx) to the user ### mock-swap-router program (test fixture) - Stores per-asset `usdc_per_token` exchange rates in `AssetRate` PDAs - `swap_usdc_for_asset` — receives USDC, mints basket tokens (used by invest) - `swap_asset_for_usdc` — burns basket tokens, releases USDC (used by rebalance) - `router_authority` PDA holds mint authority for all basket token mints ### Oracle (Pyth) NAV is computed from Pyth `PriceUpdateV2` accounts. Feed pubkeys are stored in the Strategy at creation. Prices older than 60 seconds are rejected. Raw byte offsets are used to read price data, avoiding the borsh 0.10/1.x incompatibility between the Pyth SDK and Anchor 1.0. ### Financial math No floats; u128 intermediates; multiply-before-divide; all arithmetic via checked_* methods; transfer_checked for all token moves. ### Tests (LiteSVM, 8 tests) Covers all instructions including NAV-based deposit pricing, fee accrual via mock clock advancement, in-kind withdrawal, rebalance, and slippage rejection. Mock Pyth PriceUpdateV2 accounts injected directly into LiteSVM. ### Also adds - defi/ workspace members in root Cargo.toml - Vault Strategy entry in root README.md https://claude.ai/code/session_01XUvydGu8rPSbM1AxLJ2GpA
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Manager-run investment vault with two programs: vault-strategy (deposits,
share minting, NAV-based pricing, fee accrual, in-kind withdrawals) and
mock-swap-router (test-only fake Jupiter for USDC→asset swaps via CPI).
Includes 7 LiteSVM tests, README, and root workspace/README updates.
https://claude.ai/code/session_01XUvydGu8rPSbM1AxLJ2GpA