[DO NOT MERGE] refactor(sdk): ponytail sweep — delete what the refactor no longer needs

[cyaiox]

Post-completion simplification pass over the network layer, behavior-
preserving (wire goldens byte-identical, red suite unchanged at
exactly #11/#13, all gates green). Net -95 lines:

• runtime-context.ts folded back into addSyncTransport (its planned
  second consumer never materialized; two atoms + one kickoff = 4
  inline lines)
• chunkCrdtMessages deleted by executing its own ponytail marker:
  test call sites now compose packChunks(readMessages(...)) directly
• server/index.ts: LIVEKIT_MAX_SIZE re-export shim,
  findExistingNetworkEntity wrapper (zero external callers), and
  commented-out logs removed
• getMessagesToSend() folded into its single call site (splice(0)
  idiom already used by the comms buffer)
• Room: unused _engine ctor param dropped, binaryMessageBus typed
  (was any), fields collapsed to parameter properties;
  RESERVED_MESSAGE_PREFIX and fixTransformParent de-exported
• ~30 comments that restated the line below them removed; harness
  drops its unread raw 'delivered' array from the returned object
• host-conformance.md: stale line references repointed, stray
  authoring artifact removed

Deliberately kept (checked, load-bearing): the two isRoomReady sites
(disjoint orderings), the dump accumulator's three fields, both
players exports, every sdk-commands defensive branch.

Claude-Session: https://claude.ai/code/session_01Kzo6zwrn1CA79S4RN1dgsU

🤖 Generated with Claude Code

https://claude.ai/code/session_01Kzo6zwrn1CA79S4RN1dgsU

---

📚 Stack (splits #1505 — merge top-down within each stack)

Network layer (each PR is one self-contained, independently-green commit):

1. test(sdk): characterization baseline for the network layer refactor #1518 test harness — characterization baseline + red defect suite (this stack's root)
2. [DO NOT MERGE] refactor(sdk): network layer foundations — break cycles, single isServer, logging discipline #1519 foundations — cycle break, single isServer, logging discipline
3. [DO NOT MERGE] feat(sdk): hydration FSM — deterministic late-join and reconnect convergence #1520 hydration FSM — late-join/reconnect correctness
4. [DO NOT MERGE] feat(sdk): default-deny server validation, fixed correction path, O(1) entity lookup #1521 validator — default-deny, correction path, entity index
5. [DO NOT MERGE] refactor(sdk): unify CRDT codec into a parse-once pipeline #1522 codec — parse-once pipeline (wire goldens byte-identical)
6. [DO NOT MERGE] feat(sdk): clients target the authoritative server; registry collisions; players dedupe #1523 topology — targeted sends, registry collisions, players dedupe
7. [DO NOT MERGE] refactor(sdk): parameterize network boot, document the host contract #1524 boot + host-conformance doc
8. [DO NOT MERGE] refactor(sdk): ponytail sweep — delete what the refactor no longer needs #1525 simplification sweep (−95 lines)

sdk-commands (independent of the stack above):

• feat(sdk-commands): namespace and durably persist local dev storage per project #1526 world-storage namespacing (pre-existing WIP, carried from the working tree)
• [DO NOT MERGE] fix(sdk-commands): make the local hammurabi dev server reliable #1527 local dev-server reliability (depends on feat(sdk-commands): namespace and durably persist local dev storage per project #1526)

After a parent squash-merges, the child needs git rebase --onto origin/auth-server <old-parent> <child> — ping the session and it gets restacked.

[github-actions]

Test this pull request

• The @dcl/sdk package can be tested in scenes by running

  npm install "https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/stack/08-simplification/dcl-sdk-7.25.1-31013706532.commit-dd80870.tgz"

• The @dcl/js-runtime package can be tested in scenes by running

  npm install "https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/stack/08-simplification/@dcl/js-runtime/dcl-js-runtime-7.25.1-31013706532.commit-dd80870.tgz"

• To test with npx init

  export SDK_COMMANDS="https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/stack/08-simplification/dcl-sdk-commands-7.25.1-31013706532.commit-dd80870.tgz"
  npx $SDK_COMMANDS init

• The /changerealm command to test test in-world

  /changerealm https://sdk-team-cdn.decentraland.org/ipfs/stack/08-simplification-e2e
  

• You can preview this build entering:
  https://playground.decentraland.org/?sdk-branch=stack/08-simplification