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feat: blueprint v2 envelope — writer, dual-write, round-trip harness (terrain-water task 02)

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v2 tagged-section container (D-030): raw ISLA magic + u32 version gate,
[u32 tag][u64 length][payload] sections — params (resolved generation
inputs incl. impact centre), heights f32, biomes u8, towns with the
highway-node flag, four road tiers identified by tag not position.

- BlueprintFormat.cs: the single tag/constant registry.
- BlueprintWriter.WriteV2: blueprint-typed, callable outside a
  generation run; generator and harness are both just callers.
- ExportMapData dual-writes: v2 under the primary seed name, legacy v1
  beside it as _v1.dat (safety net; removal is a future task).
- MapDataParser: LoadMapDataFromPath entry point; v1 parse body
  extracted intact as LoadV1 (v2 reader lands in the next commit).
- RoundTripHarness scene: load v1 -> write v2 -> load v2 -> semantic
  equality, headless, seconds per cycle.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Stewart Howe 2026-08-06 07:24:08 -04:00
parent ad541dfbd8
commit c305fd6565
6 changed files with 494 additions and 9 deletions
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6
Tools/Scenes/RoundTripHarness.tscn Normal file
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[gd_scene load_steps=2 format=3]
[ext_resource type="Script" path="res://Tools/Scripts/RoundTripHarness.cs" id="1_rth"]
[node name="RoundTripHarness" type="Node"]
script = ExtResource("1_rth")