docs(reference): document TISH_PACKED_ARRAYS flag (sound, default-off perf wash) - #1
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… perf wash) Add a "Value-representation flags" subsection to the Native Backend reference documenting TISH_PACKED_ARRAYS: unboxed Vec<f64> arrays across all backends with in-place deopt on non-numeric stores, sound (full parity sweep + GAUNTLET checksums vs Node), but kept off by default because it is a performance wash — the VM JIT does not consume NumberArray, so packed never reaches the tier that speeds numeric loops (flag-on within ~1% of flag-off).
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Adds a Value-representation flags subsection to the Native Backend reference documenting
TISH_PACKED_ARRAYS: unboxedVec<f64>numeric arrays across all backends (interp/vm/native) with in-place deopt (Packed → Boxed) on non-numeric stores so aliases stay sound; sound (full parity sweep flag-on vs flag-off across backends + GAUNTLET checksums vs Node); kept off by default on purpose because it is a performance wash — the VM JIT does not consumeNumberArray, so packed never reaches the tier that speeds numeric loops (flag-on within ~1% of flag-off). Mirrors the authoritativedocs/packed-arrays.mdin the tish repo (tishlang/tish#521, following #520). Docs-only.