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- PipeCalls.def gains a FIFTH COLUMN, WaitClass, on every row, and gen_pipe.py generates MGPipeWaitClassFor(op) beside kMGPipeCallFlags. It is a VALUE and not a new op: opcode order and the flag column are untouched, and the point of generating it is that the emit table and the sink compute the barriered predicate's static half from ONE table instead of two copies that agree until they do not. - Two new generator gates, each with its own --self-test negative control: a token that is not an MGPipeWaitClass enumerator, and - both ways - a kReplySlot row that does not wait for its reply or a kWaitReply row that owns no slot. The first would be a waiter that hangs, the second a block on an answer nobody posts. Twelve controls trip now, up from nine. - set_program_bindings appended as opcode 80 (kCtxState, kVarTail|kHostSpan): the three POST-LINK mutable reflection fields, which live inside the LinkArtifacts the archive snapshots and all move after the link, so no existing row can carry them. It lands with a NULL ROUTE and a sink arm that validates and declines, exactly as set_shader_buffers has sat catalogued-and-dead since P4a. - The codec's record layout grows to THREE tails for it, with each declared count refused against its bound rather than truncated, and the third tail's name spans walked through CheckHostSpanIsHonest in the decode arm - they are members of a 40-byte element, so the encoder's blanket second-tail pass would read one span and a quarter of garbage. - PipeCatalogueTest: the new sizes (MGPProgramDesc 200), the opcode-80 and null-route pins, the draw flag, and a wait-class case that re-states CONTRACT-P5E section 2.2's table BY NAME rather than reading the def - every other statement about the column is derived from the def and moves with it, so this is the second place a demoted row has to be argued. The ABI fingerprint moves with MGPWireOp::kOpCount, which the handshake case already pins.