Adapt framework code for MC 1.21.11 - part 2/3

[mj41]

Credits

Co-authored with Claude Opus 4.6 (Anthropic) via GitHub Copilot.

Summary

Hand-written framework changes to support Minecraft 1.21.11 (protocol 774).
Updates bot, server, level, registry, chat/signing, inventory, and component
infrastructure.

This PR contains only human-authored code changes — no auto-generated files.
Depends on PR #294 (tools pipeline). The generated data files follow in PR #296.

Commit

Adapt framework code for MC 1.21.11 — 41 files changed, 1,317 insertions(+),
204 deletions(-)

Changes by Category

Protocol Version

• Bot ProtocolVersion: 767 → 774
• Server ProtocolVersion: 764 → 774
• Version string: "1.21.11"

Protocol Fixes

• Registry handling (registry/): Added ExtraRegistries map for unknown
  registry types sent by 1.21.11 servers. Registry() returns dynamic registry
  instead of nil. Tags handler no longer fatals on unknown registries. ReadFrom
  always calls Put() to maintain ID ordering. Tags gracefully skip
  out-of-range IDs.
• BitStorage (level/palette.go): Removed VarInt data array length prefix —
  MC 1.21.5+ (protocol 770+) no longer sends it. Reader computes expected long
  count from bits-per-entry and container capacity.
• Teleport packet (bot/basic/events.go): Rewritten for protocol 769+
  format — TeleportID first, added DX/DY/DZ velocity fields, Flags from byte
  to int32.
• Player settings (bot/basic/settings.go): ViewDistance/ChatMode/MainHand
  widened from int8 to int, added ParticleStatus field.
• Chunk heightmaps (level/chunk.go): Encode as typed long arrays instead
  of NBT compound for protocol 774+.
• TrustEdges removed (level/chunk.go): Removed from both ReadFrom and
  WriteTo (dropped in MC 1.20.2).

Chat & Signing

• HistoryUpdate checksum (chat/sign/sign.go): Added Checksum byte field.
  Zero value = IGNORE_CHECKSUM (backward compatible).
• PlayerChat globalIndex (bot/msg/chat.go): Added globalIndex VarInt as
  first field (new in 1.21.11).
• PackedSignature (chat/sign/sign.go): Fixed value→pointer receiver, added
  id - 1 decode for wire format, io.ReadFull for 256-byte signatures.

Inventory & Components

• Slot format (bot/screen/screen.go): Rewrote ReadFrom/WriteTo for
  post-1.20.5 format. ReadFrom now consumes component data via
  component.NewComponent(). WriteTo sends Count→ItemID→0→0 (no custom
  components). Removed NBT field.
• SetPlayerInventory handler (bot/screen/screen.go): New handler for
  ClientboundSetPlayerInventory packet (1.20.5+).
• Component infrastructure (level/component/types.go): 541 lines of shared
  component types — EitherHolder, Holder, CompositeHolder, ItemSlot,
  FilterableText, SoundEvent, etc.
• New component files: bannerpatterns.go, bees.go, blocksattacks.go,
  blockstate.go, eitherholder.go, kineticweapon.go, profile.go,
  writtenbookcontent.go
• Updated components: attributemodifiers.go, enchantments.go,
  lodestonetracker.go, suspicioussteweffects.go, tool.go,
  writablebookcontent.go

Server-Side

• RegistryData format (server/configuration.go): Rewrote from single NBT
  blob to per-registry packets (1.20.5+ format).

Breaking Changes

• Slot struct: Removed NBT field, added ComponentsAdd/ComponentsRemove
• Teleported callback: flags byte → flags int32
• ClientboundLoginGameProfile renamed to ClientboundLoginLoginFinished
• Bot/Server ProtocolVersion changed

Related

• Issue: Support for 1.21.4? #289
• Depends on: PR Does it support 1.14? #1 (tools pipeline)