Authority: Preserve durable world entities and support scripting vetoes

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Allows durable world entities to delegate physics without allowing their client owner to destroy them. Replicates the server's virtual world and lets script placement overrides commit durable state before publishing it; rejected rotation writes become catchable JS errors.

Wire format changes: Framework version 29 requires matching clients and servers. Prerequisite for KCDC inventory core #9 world inventory #11, and alchemy #10.

The downstream server scripting setters item.position, item.rotation and item.setVirtualWorld(...) can now commit authoritative placement through overrides; server-controlled world changes also reach the current owner. This companion adds no new inventory scripting namespace. See the authority API and integration examples.

Alchemy also needs a precommit veto that refuses handler errors. EmitReservedSync(..., Events::SynchronousFailurePolicy::Veto) rejects literal false, exceptions and returned Promises; its default preserves existing callers. No handler can undo another handler's veto. See approval semantics and a resource example.

Testing:

• builds\build.bat RunFrameworkTests 64 — 469 passed, including owner destruction refusal, server deletion, late-join world seeding, owner world pushes forged world updates, and strict/default synchronous approval behavior.
• Manual integration: delegate a durable item's physics, confirm owner deletion is refused, then remove it from the server. Check valid/refused script placement and a late joiner's world. These checks remain to be repeated on the extracted KCDC branch.

Summary by CodeRabbit

• New Features
  • Added synchronous approval controls for event handlers. Returning false refuses an operation; with the veto policy, handler errors or returned Promises also refuse it.
  • Virtual-world changes now replicate to clients and owners, including in forced updates.
  • Entities can restrict destruction requests from their owners.
• Improvements
  • Errors from invalid entity rotation updates are now reported to scripts.
• Documentation
  • Added guidance for server-controlled entity lifetimes and synchronous event approval. This release updates the wire format, so server and client versions must be compatible.

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Reviewing files that changed from the base of the PR and between a1a07d8 and b11d9ae.

📒 Files selected for processing (3)

• VERSION
• code/framework/src/scripting/builtins/events.cpp
• code/tests/modules/js_features_ut.h

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Walkthrough

Network entities gain an owner-destruction policy hook and server-authoritative virtual-world replication. Script entity setters become overridable, and rotation setter exceptions are forwarded to JavaScript. The version changes to 29.0.0.

Changes

Server-Owned Entity Policies

Layer / File(s)	Summary
Owner destruction policy code/framework/src/networking/replication/network_entity.h, code/framework/src/networking/replication/network_entity.cpp, code/tests/modules/replication_authority_ut.h	NetworkEntity adds CanOwnerDestroy(), which defaults to true. The server checks this policy when it evaluates destruction requests. Tests cover server rejection and client acceptance when the policy returns false.
Server-authoritative virtual world VERSION, code/framework/src/networking/replication/network_entity.cpp, code/tests/modules/replication_authority_ut.h	The server serializes the virtual-world value, and clients apply the received value. Tests cover construction, server state changes, and owner assignment attempts. The version changes from 28.0.1 to 29.0.0.
Script entity setter extension points code/framework/src/scripting/builtins/entity.h, code/framework/src/scripting/builtins/entity.cpp, docs/server-owned-entity-lifetime.md	Position, rotation, and virtual-world setters become virtual. The rotation setter forwards caught std::exception messages to JavaScript as Error exceptions. The documentation describes these changes and the entity policies.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Suggested reviewers: segfaultd

Merge Risk: ⚪ Minimal · up to b11d9

No confirmed issue blocks merging. Exception behavior for rejected position and virtual-world writes remains unverified.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to b11d9

Client controls over durable entities are tightened, but the new replication format requires coordinated client and server upgrades. Integrations also remain responsible for committing approved state safely.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The lifetime gate limits a connected client's deletion authority at each entity it claims to own; the world field protects server placement authority across the owner's upstream updates and other clients' replicated views.

Trust Boundaries and Controls

• observed — The synchronous reserved-event entrypoint selects global handlers rather than client-event handlers. The existing native chat-send caller omits the new policy argument, retaining default approval behavior rather than exposing Veto as a client-selected option.

Resilience and Maintainability Implications

• observed — Once handlers are consumed before invocation and exceptions are contained within dispatch; ordinary handlers may still run again during a separate or nested dispatch. Approval alone provides neither transaction rollback nor general idempotency.

Hardening Proposals

• proposed — Confirm that version negotiation rejects mixed protocol versions during upgrade and rollback, rather than relying solely on the documented matching-version requirement.
• proposed — In downstream integrations, keep proposals detached, revalidate identity and revision after handlers return, and commit durable placement before publishing its replicated state. Verify that rejected position and virtual-world setter exceptions reach JavaScript through their binding paths.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 22.73% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 9 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the two primary changes: preserving durable world entities and supporting scripting vetoes.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 22.73% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 9 files. (1 skipped: 1 unsupported.)

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_{A rabbit checks the world’s new place,
And guards the lifetime with care and grace.
The server sends the world along,
While scripts may tune where things belong.
A caught rotation error joins the song.}

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at
@code/framework/src/networking/replication/network_entity.cpp:
- Line 82: Update the server virtual-world change path around
fields.ServerField(world) to deliver the authoritative world update directly to
the entity’s current owner, independently of QuerySerializationWithinWorld
filtering. Ensure the owner’s client copy receives the new world even when the
entity remains visible and SerializeForcedState is used.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 9f97d4e0-f91f-4c61-a702-9eda10518d39

📥 Commits

Reviewing files that changed from the base of the PR and between 0486618 and 8888cc7.

📒 Files selected for processing (7)

• VERSION
• code/framework/src/networking/replication/network_entity.cpp
• code/framework/src/networking/replication/network_entity.h
• code/framework/src/scripting/builtins/entity.cpp
• code/framework/src/scripting/builtins/entity.h
• code/tests/modules/replication_authority_ut.h
• docs/server-owned-entity-lifetime.md

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