docs(editor): FORMAT_SPEC.md documenting all 5 novel open file formats

tools/editor/FORMAT_SPEC.md

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+# Wowee Open Format Specification v1.0
+
+Novel file formats for custom WoW zone content. No Blizzard IP.
+
+## WOT — Wowee Open Terrain (JSON metadata)
+- Extension: `.wot`
+- Contains: tile coords, texture list, per-chunk layers/holes, water data
+- Key: `"format": "wot-1.0"`
+
+## WHM — Wowee HeightMap (binary)
+- Extension: `.whm`
+- Magic: `WHM1` (0x314D4857)
+- Layout: magic(4) + chunks(4) + vertsPerChunk(4) + [baseHeight(4) + heights[145](580)] × 256
+
+## WOM — Wowee Open Model (binary)
+- Extension: `.wom`
+- Magic: `WOM1` (0x314D4F57)
+- Layout: magic(4) + vertCount(4) + indexCount(4) + texCount(4) + bounds(28) + name + vertices + indices + texPaths
+- Vertex: position(vec3) + normal(vec3) + texCoord(vec2) = 32 bytes
+
+## WOB — Wowee Open Building (binary)
+- Extension: `.wob`
+- Magic: `WOB1` (0x31424F57)
+- Layout: magic(4) + groupCount(4) + portalCount(4) + doodadCount(4) + bounds(4) + name + groups + portals + doodads
+- Group: name + vertices(pos+normal+uv+color) + indices + texPaths + bounds + outdoor flag
+
+## WCP — Wowee Content Pack (archive)
+- Extension: `.wcp`
+- Magic: `WCP1` (0x31504357)
+- Layout: magic(4) + fileCount(4) + infoJsonSize(4) + infoJSON + [pathLen(2) + path + dataSize(4) + data] × N
+
+## zone.json — Map Definition
+- Replaces WDT
+- Contains: mapName, mapId, tiles, biome, file references
+
+## All formats are novel, portable, and open for redistribution.