Retire pending const queue consumes

[guosran]

Summary

Addresses #292 with a minimized const queue consume fix. This PR updates ConstQueueDynamicRTL.py plus shared opcode definitions in lib/opt_type.py.

Changes

• Remember a const consume handshake until ctrl_proceed retires it.
• Prevent const queue read pointer updates from being lost when consume and control proceed happen in different cycles.
• Add the required shared const opcode list.

Validation

Part of the master-based small conv passing set.

[guosran]

Some const operations consume a const token later than the opt token arrives.

cycle 0: opt arrives for ADD_CONST
cycle 1: const token arrives

Before:
const queue could treat the opt as already handled and lose alignment.

After:
ConstQueueDynamicRTL tracks pending const consumption until the const token is actually accepted.