Perpetual Maturity

For assets without natural expiry, we implement new-style renewal:

At maturity:

• If PT₍c₎ ≥ YT₍c₎ → excess BT (PT₍c₎-YT₍c₎) flows into the new maturity pool

• If PT₍c₎ < YT₍c₎ → missing BT is pulled from the base BT vault

LP shares remain valid forever. Upon renewal:

• New PT & YT are issued

• Old vPT is reset to 1:1 with BT again. Users and LPs can stay in the pool indefinitely without fragmentation.