rrt/artifacts/exports/rt3-1.06/runtime-effect-kind8-tier2-named-availability-note.md

# Runtime Effect Kind-8 Tier2 Named Availability Note

This note records the current named-candidate availability comparison between the strongest
title-overlap pair:

- `Louisiana.gmp`
- `Dutchlantis.gmp`

The comparison uses the checked `rt3_105_save_name_table_probe` surface from `inspect-smp`.

## Immediate Result

`Warehouse05` is **not** the differentiator.

Observed values:

- `Warehouse05`
  - `Louisiana.gmp = 1`
  - `Dutchlantis.gmp = 1`
- `Port01`
  - `Louisiana.gmp = 1`
  - `Dutchlantis.gmp = 1`
- `Furniture Factory`
  - `Louisiana.gmp = 1`
  - `Dutchlantis.gmp = 1`
- `FarmGrain`
  - `Louisiana.gmp = 1`
  - `Dutchlantis.gmp = 1`
- `Logging Camp`
  - `Louisiana.gmp = 1`
  - `Dutchlantis.gmp = 1`

So the strongest current `Louisiana -> Dutchlantis` title overlap does not also come with a unique
`Warehouse05` availability toggle that would directly explain the one-row
`Add Building Warehouse05` dispatch cluster in `Louisiana.gmp`.

## Full Named-Availability Differences

The current comparison shows `18` differing names:

- `AluminumMill`: `Louisiana = 0`, `Dutchlantis = 1`
- `AutoPlant`: `Louisiana = 0`, `Dutchlantis = 1`
- `Bauxite Mine`: `Louisiana = 0`, `Dutchlantis = 1`
- `Chemical Plant`: `Louisiana = 0`, `Dutchlantis = 1`
- `Farm Corn`: `Louisiana = 1`, `Dutchlantis = 0`
- `FarmCotton`: `Louisiana = 1`, `Dutchlantis = 0`
- `FarmRice`: `Louisiana = 1`, `Dutchlantis = 0`
- `FarmSheep`: `Louisiana = 0`, `Dutchlantis = 1`
- `FarmSugar`: `Louisiana = 1`, `Dutchlantis = 0`
- `Fertilizer Factory`: `Louisiana = 0`, `Dutchlantis = 1`
- `Iron Mine`: `Louisiana = 0`, `Dutchlantis = 1`
- `Nuclear Power Plant`: `Louisiana = 0`, `Dutchlantis = 1`
- `Oil Refinery`: `Louisiana = 1`, `Dutchlantis = 0`
- `Plastics Factory`: `Louisiana = 0`, `Dutchlantis = 1`
- `Recycling Plant`: `Louisiana = 0`, `Dutchlantis = 1`
- `Steel Mill`: `Louisiana = 0`, `Dutchlantis = 1`
- `Tool And Die`: `Louisiana = 0`, `Dutchlantis = 1`
- `Uranium Mine`: `Louisiana = 0`, `Dutchlantis = 1`

The broader `compare-candidate-table` surface agrees with the same conclusion:

- common semantic family remains `scenario-named-candidate-availability-table`
- `Warehouse05` stays `1 / 1`
- `difference_count = 43`, but those differences are still driven by the wider industrial mix,
  header words, and the zero-trailer-name set rather than by any unique `Warehouse05` bit

## Current Implication

The Tier 2 candidate/world-state rebuild strip remains plausible in general because it owns named
candidate availability seeding and refresh, but the current evidence no longer supports the narrow
claim that `Louisiana.gmp` gets its `Add Building Warehouse05` row from a unique
`Warehouse05` availability difference relative to `Dutchlantis.gmp`.

Two deeper grounded notes tighten that further:

- `structure_candidate_collection_rebuild_runtime_records_from_scenario_state` `0x00412d70`
  does **not** consult the scenario-side recipe-book name at `[state+0x0fe8]`; it formats the
  rebuilt candidate display stem from one of two fixed built-in roots `0x005c93d8` or
  `0x005c93e8` plus the current ordinal.
- `scenario_state_upsert_named_candidate_availability_record_and_refresh_runtime_filters`
  `0x00434f20` now reads safely as a real boolean availability override writer rather than a wider
  mode enum.

So the next Tier 2 recovery question is now tighter still:

- whether the relevant difference is in broader candidate-state rebuild sequencing, latch refresh,
  or cargo-membership/runtime-record reconstruction under
  `0x00437737 / 0x00412c10 / 0x00412bd0 / 0x00412d70 / 0x00412fb0`,
  rather than in the direct named availability bit for `Warehouse05` itself.

## Nearest Single-Import Peer Check

The same boundary now holds against the nearest single-import recipe peer too:

- `Louisiana.gmp`
- `South East USA.gmp`

Direct `inspect-candidate-table` checks still keep the key port/warehouse rows aligned:

- `Warehouse05`
  - `Louisiana.gmp = 1`
  - `South East USA.gmp = 1`
- `Port01`
  - `Louisiana.gmp = 1`
  - `South East USA.gmp = 1`

So even after the recipe-side frontier moved from “same coarse mode shape” to “same single-import
family,” the direct named-availability table still does not provide the missing Tier 2 split for
the shipped `5200 :: [7:0]` `Add Building Warehouse05` row.

That leaves the same later owners as the honest next focus:

- `0x00412d70` template-bank and runtime-record rebuild
- `0x00411ce0 / 0x00411ee0` dependent mode-flag and cargo-summary refresh
- `0x00412c10` latch refresh after those runtime records already exist

## Port Versus Warehouse Runtime Roots

One broader binary pass now closes the fixed-root ambiguity inside `0x00412d70`.

Direct `objdump` over `RT3.exe` shows the two built-in format roots are:

- `0x005c93d8 = "Warehouse%02d"`
- `0x005c93e8 = "Port%02d"`

And the candidate rebuild chooses between them exactly as:

- if `[candidate+0xba] != 0`
  - use `Port%02d`
- else
  - use `Warehouse%02d`

So the later Tier 2 runtime-record frontier is no longer an abstract “two built-in roots” question.
It is specifically:

- how `0x00412d70` bank or template selection and the live availability bytes
  `[candidate+0xba/+0xbb]` determine which rebuilt candidates land on the `Warehouse%02d` side
  versus the `Port%02d` side
- and why the `Warehouse%02d` side in `Louisiana.gmp` is the one that later lines up with the
  shipped `5200 :: [7:0]` `Add Building Warehouse05` strip

That also keeps the direct named-availability boundary honest:

- `Warehouse05 = 1` in the fixed scenario table still does not explain the runtime split by itself
- the next meaningful owner seam is the later port-versus-warehouse runtime-record rebuild under
  `0x00412d70`, before `0x00412c10` mirrors anything into `[candidate+0x7ac]`

## Writer-Side Split Above The Availability Bytes

One more direct disassembly pass narrows that owner seam further.

`structure_candidate_stream_load_runtime_record_and_rebuild_cargo_state` `0x004120b0` does
rebuild a substantial portion of each live candidate record:

- clears dependent runtime pointers and flags such as
  `[candidate+0x79c/+0x7a0/+0x78c/+0x790/+0x794/+0x7b0]`
- reads the fixed per-record stream fields at
  `[candidate+0x04/+0x22/+0x26/+0x28/+0x2a/+0x2e/+0x32/+0x33]`
- restores the selector-bank bytes
  `[candidate+0xb9/+0xba/+0xbb]`
- allocates and streams the packed `0xbc` descriptor array into `[candidate+0x37]`

So the current strongest ownership split is now:

- direct named-availability table `[state+0x66b2]` is not the missing differentiator by itself
- both source-record import `0x00414490` and per-record stream-load `0x004120b0` do carry the
  relevant selector-bank bytes from persisted/source state into the live candidate family
- but the stock `Data/BuildingTypes/*.bca` corpus currently keeps `[record+0xb8/+0xb9/+0xba/+0xbb]`
  at zero across every observed file, including `Warehouse.bca` and `Port.bca`
- so the surviving frontier is no longer “does the lower loader import `[candidate+0xba/+0xbb]`?”
  but rather which later owner or alternate content path makes the live bank-qualified split differ
  from that all-zero shipped BCA corpus before `0x00412d70` clones or reuses one bank-qualified
  live candidate

That makes the next Tier 2 question more concrete still:

- how any nonzero bank-qualified template source under `[candidate+0xba]` versus `[candidate+0xbb]`
  is actually seeded above the stock all-zero BCA corpus, and then
  drives the later `Warehouse%02d` side in `Louisiana.gmp`
- and whether that preserved bank/template state is the real bridge from the minimal recipe cluster
  to the shipped `5200 :: [7:0]` `Add Building Warehouse05` row