[codex] Lock standard stableswap minimum liquidity

[caydyan]

Summary

• permanently lock u1000 LP tokens during standard stableswap pair creation
• mint only the remaining initial LP supply to the pair creator while keeping total shares unchanged
• reject initial liquidity that cannot cover the permanent lock

Why

The standard stableswap pool currently mints the entire initial LP supply to the creator, so the first LP can later burn all of their shares and fully empty the pool. Locking a small minimum LP supply follows the same protection added for the StackingDAO stableswap path and prevents total pool depletion.

Validation

• git diff --check
• clarinet check
• clarinet console create-pair path confirmed creator LP u1999999999999000, contract-locked LP u1000, and full creator withdrawal leaves balance-x: u500, balance-y: u5, total-shares: u1000
• clarinet console tiny initial liquidity path returns (err "err-initial-liquidity-too-low")

Note: the local environment does not have deno, so the TypeScript Clarinet tests were added but not executed here.