feat: blueprint v2 reader dispatch + validation + params cross-check (terrain-water task 02)
Reader sniffs the first byte (0x49 raw-ISLA v2 vs 0x07 v1 string
prefix) and routes to the v2 tagged-section parser or the intact v1
path (v1 loads log a deprecation warning — fallback stays live).
v2 validation: magic/version gate (loud reject), MapSize sanity bound
[256, 32768] before allocation, every section length checked against
remaining file, section-consumed-exactly check, params-first and
no-duplicate-section rules, biome and town-tier ordinal range checks.
Unknown tags skip by length — the forward-compat property D-030 buys.
ServerChunkManager cross-checks embedded params against config
(seed + MapSize) and logs a prominent desync warning — canon H7's
silent failure becomes loud. ServerConfig.json pins the reference
world: WorldSeed 1409879727, 8K.
Round-trip oracle GREEN: reference v1 (537,054,156 B) -> v2
(335,727,522 B, -192 MB) -> parse -> semantic equality holds
(heights bitwise, biomes, 94 towns, 4/1/37/39 road paths
point-for-point). v1 parse 1.9s, v2 write 1.4s, v2 parse 1.6s.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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