The immediate: fifteen bits, clamped, and read back

An immediate lives in 15 bits of two's complement, -16384 to 16383. Push it past the edge and watch it clamp, then decode the word back.

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Where the numbers come from

gHashTag/t27 specs/isa/ternary_encoding.t27: the TRI-27 instruction word as the pinned Trinity emulator decodes it (src/tri27/emu/decoder.zig at 976df517); every value on the page is its fn bodies, compiled to wasm (logic.js)