Add OR_SINGLESHOT_MODE_BITS instruction to CFO compiler

[Copilot]

Companion to otsdaq-mu2e#280. Adds OR_SINGLESHOT_MODE_BITS (opcode 111) as a new CFO instruction — a single-shot OR that fires only once in hardware, with identical argument syntax and parameter encoding as OR_MODE_BITS (opcode 103).

Changes

• CFO_Compiler.hh — new enum value OR_SINGLESHOT_MODE_BITS = 111 in CFO_INSTR
• CFO_Compiler.cpp
  • Added to OP_to_CODE_TRANSLATION and CODE_to_OP_TRANSLATION maps
  • Added to outer case block in calculateParameterAndErrorCheck() (fall-through with OR_MODE_BITS to share 7-argument parsing)
  • Added to inner switch via fall-through from OR_MODE_BITS (shared encoding logic)

// Outer switch: shares argument validation with OR_MODE_BITS
case CFO_INSTR::OR_MODE_BITS:
case CFO_INSTR::OR_SINGLESHOT_MODE_BITS: {
    // ... 7-arg parsing (start_bit, bit_count, value) ...
    
    // Inner switch: shared calculation
    case CFO_INSTR::OR_MODE_BITS:
    case CFO_INSTR::OR_SINGLESHOT_MODE_BITS:
        value <<= startBit;
        value &= bitmask;
        return value;  // OR / OR (single-shot)
}

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