docs: add CHANGES.md with full changelog

CHANGES.md

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+# Changelog — Dynmap NeoForge 1.21.1 Port
+
+All changes relative to the upstream `neoforge-1.20.6` module.
+
+---
+
+## [Unreleased] — canOcclude() fix
+
+### Changed
+- `DynmapPlugin.initializeBlockStates()`: replaced `isSolidRender(EmptyBlockGetter.INSTANCE, BlockPos.ZERO)` with `canOcclude()`
+
+### Why
+`isSolidRender()` triggers a Guava `LoadingCache` lookup that deadlocks when performance mods (e.g. `modernfix`) use lazy/deferred block state cache generation. This causes the server watchdog to kill the process after a ~60s hang during world load.
+
+`canOcclude()` reads a precomputed boolean directly from the block state with no cache involvement — functionally equivalent for Dynmap's purposes and safe with all mods.
+
+---
+
+## [2026-03-07] — Runtime fixes + build improvements
+
+### Fixed — API changes (1.21.1)
+- `DynmapPlugin`: `ServerTickEvent` listener updated to `ServerTickEvent.Post`
+  - NeoForge 21.x made `ServerTickEvent` abstract; registering the base class directly no longer works
+- `DynmapPlugin.initializeBlockStates()`: replaced `isSolidRender(null, ...)` with `isSolidRender(EmptyBlockGetter.INSTANCE, BlockPos.ZERO)`
+  - 1.21.1 actually uses the BlockGetter parameter; passing null causes NPE
+- `ForgeMapChunkCache`: replaced `visibleChunkMap` direct field access with `getChunks()` iteration
+  - `visibleChunkMap` field was removed in 1.21.1
+- `ForgeMapChunkCache`: replaced `getChunkToSend()` with `getLatestChunk()`
+  - `getChunkToSend()` was removed in 1.21.1
+- `ForgeWorld.getWorldName()`: replaced `serverLevelData.getLevelName()` with `getServerLevelData().getLevelName()`
+  - Field became private in 1.21.1
+
+### Fixed — Build
+- `build.gradle`: Fixed `shadowJar` configuration — DynmapCore libs now in `shadow` config (not just `implementation`)
+  - Was producing a hollow 80KB jar missing all core classes; now produces correct fat jar (~35MB)
+- `build.gradle`: Added `build.dependsOn(shadowJar)` so standard `./gradlew build` produces the fat jar
+- `build.gradle`: Forked javac heap capped at `-Xmx3g` via `JavaCompile.forkOptions`
+- `gradle.properties`: Gradle daemon heap capped at `-Xmx2g` (was `-Xmx4g`, caused OOM on high-RAM hosts)
+
+### Notes
+- Gradle wrapper must stay at **8.7** — upgrading to 8.14 breaks the `fabric-loom` plugin in other monorepo modules
+
+---
+
+## [2026-03-07] — Initial 1.21.1 compile fix pass
+
+### Fixed — Compile errors (43 total)
+All compile errors resolved when porting from the `neoforge-1.20.6` module baseline:
+- NeoForge userdev Gradle plugin updated: `net.neoforged.gradle.userdev` → `7.1.20`
+- NeoForge dependency version: `21.1.219`
+- Various API removals/renames across `DynmapPlugin.java`, `ForgeMapChunkCache.java`, `ForgeWorld.java`
+- Access transformer updated for 1.21.1 private field access patterns
+  - One AT warning remains (`read(ChunkPos)CompletableFuture` not found) — harmless, can be cleaned up
+
+---
+
+## Format
+
+Entries are dated by session (not release), since this is a port-in-progress, not a versioned release.