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rrt/docs/rehost-queue/tier2-selector-byte-sources-2026-04-21.md

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Tier2 Selector-Byte Sources (2026-04-21)

This note preserves the stock selector-byte evidence behind the current Tier-2 queue head, so the short queue does not have to restate the BuildingTypes side every time.

Checked Export

  • artifacts/exports/rt3-1.06/building-type-sources.json

Stock .bca Selector Bytes

The checked export keeps the raw 0xb8..0xbb selector-byte window explicit for every .bca file:

  • bca_file_count = 77
  • bca_selector_pattern_count = 8
  • only one checked .bca pattern is nonzero at all:
    • MachineShop.bca
    • byte_0xb8 = 0x00
    • byte_0xb9 = 0x80
    • byte_0xba = 0x3f
    • byte_0xbb = 0x00

Everything else in the shipped .bca selector-byte corpus stays zero at 0xb8..0xbb.

Nonzero .bty Alias Family

The checked recovered-table summaries keep the nonzero .bty alias family explicit too:

  • nonzero_bty_header_alias_selector_summaries
    • 17 grouped selector summaries
    • 22 files total
  • the strongest same-root family is the TextileMill alias-root group:
    • dword_0xbb = 0x000001f4
    • byte_0xba = 0x00
    • byte_0xbb = 0x00
    • 9 files
    • sample files include Port.bty, Warehouse.bty, ConcretePlant.bty, ConstructionFirm.bty, and ElectronicsPlant.bty

The next smaller nonzero alias-root groups are:

  • LumberMill
    • 4 files
  • MeatPackingPlant
    • 4 files
  • Distillery
    • 2 files
  • Toolndie
    • 2 files

Immediate Reading

This keeps the Tier-2 source side narrower than a generic “stock assets might hide selector bytes” claim:

  • the shipped .bca selector-byte corpus is almost entirely zero
  • the one checked nonzero .bca outlier is MachineShop.bca
  • the broader stock-side nonzero signal sits instead in the .bty alias-root family with dword_0xbb = 0x000001f4, especially the TextileMill branch that already covers Port.bty and Warehouse.bty

So the remaining Tier-2 question is still not “do the stock source files carry any selector-byte signal at all?” It is which earlier seed or projection seam lifts that narrow stock-side signal into the live candidate bank bytes [candidate+0xba/+0xbb] before 0x00412d70 and 0x00419230 consume it.