# M01-FND-DOMAIN-IDENTITIES-001 — Stable domain identity namespaces

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## Ownership

- Target: M01
- Program: FND
- Owner/Agent ID: sindo-main-codex
- Branch: `work/sindo-main-codex/m01-domain-identities`
- Lease expires UTC: 2026-07-15
- Integrator: M01 milestone integrator

## Outcome

Add scene-free, immutable identity values for stable authored content,
session-local entities, opaque WoW wire GUIDs and namespaced server entries so
callers cannot silently interchange their numeric/string representations.

## Non-goals

- Allocating Content IDs, Entity IDs or server entries.
- Decoding WoW GUID high types before the build-12340 protocol package.
- Defining map/spell/item/quest/display/sound IDs in this package.
- Migrating gameplay, network or Content Project consumers that do not exist yet.

## Paths

- Exclusive: `src/domain/identity/`, `src/tools/verify_domain_identities.gd`,
  `docs/modules/domain-identities.md`, `docs/adr/0002-domain-identity-namespaces.md`
- Shared/hotspots: `docs/ARCHITECTURE.md`, this claim
- Generated/ignored: Godot import metadata

## Contracts and data

- `ContentId`: canonical lowercase UUID text persisted with schema-owned content
- `EntityId`: positive session-local integer, never a persisted content/server identity
- `WowGuid`: opaque high/low unsigned 32-bit words preserving wire bits
- `ServerEntryId`: positive integer plus non-empty adapter/table namespace
- Migration: additive types only; no existing persisted data changes

## Dependencies

- Requires: M01 coordinate/focus seams through `77cd17a`
- Blocks: Content Project schemas, server adapters, network entity mapping and gameplay registry
- External state: no dependency or proprietary input

## Verification

- Commands: identity contract/boundary verifier, dependency search,
  coordination/documentation gates and headless project load
- Fixtures: valid/invalid UUIDs, session IDs, full unsigned GUID words and
  duplicate numeric server entries in different namespaces
- Fidelity evidence: GUID words remain opaque and lossless until build-12340
  packet fixtures establish semantic decomposition
- Performance budget: constant-time scalar/string validation outside frame loops

## Documentation deliverables

- Inline public API docs: every value and validation/equality method
- Module specification: persistence, ownership, namespace mapping and recovery
- Data-flow diagram: authored/runtime/wire/server identities into adapters
- State/sequence diagrams: lifecycle diagram for content/session/wire/server identity
- ADR: namespace separation and UUID persistence decision

## Simplicity and naming

- Important names introduced: `ContentId`, `EntityId`, `WowGuid`, `ServerEntryId`
- Simplest considered solution: four independent values with explicit fields
- Rejected complexity/abstractions: generic ID base class, registry service,
  UUID generator and speculative GUID high-type enum
- Unavoidable complexity and justification: server entry namespace and split GUID
  words prevent collisions and signed 64-bit loss
- Measured optimization evidence: not applicable

## Status

- State: ready-for-review
- Done: four identity values, boundary verifier, ADR, module specification,
  architecture mapping and repository gates
- Next: integrator review and merge before the manual axis-conversion gate
- Blocked by:

## Handoff

- Commit: `c1dc07c`
- Branch: `work/sindo-main-codex/m01-domain-identities`
- Outcome: authored content, runtime entities, WoW wire GUIDs and namespaced
  server entries now have separate immutable scene-free value objects
- Contract/schema: identity contract version 1; `ContentId` uses canonical
  lowercase UUID text. No existing schema/cache is migrated; containing future
  schemas still require their own version and duplicate/reference policy
- Verification: DomainIdentities PASS (`5` ContentId, `5` EntityId, `6` WowGuid,
  `5` ServerEntryId cases); StreamingFocus, coordinate golden fixtures and
  CoordinateMapper PASS; M00 calibration PASS with maximum error `0.000015`;
  renderer manifest PASS (`7` checkpoints); headless project load exit `0`;
  coordination, documentation, naming/dependency and whitespace checks passed
- Fidelity: `WowGuid` preserves two complete unsigned 32-bit wire words and
  explicitly does not claim build-12340 high-type semantics without packet
  fixtures; zero GUID remains an uninterpreted observable sentinel
- Rebuild: none; no dependency or proprietary input. Clean-worktree project
  load reports expected missing ignored extracted assets/character resources
- Remaining risks: no ID allocator, mapping registry or server namespace
  vocabulary exists yet; UUID shape does not enforce generator version/variant;
  GDScript callers must use domain `equals` or canonical keys rather than
  reference `==`
- Recommended merge order: after StreamingFocus at `77cd17a`, before the M01
  manual axis-conversion rule/search gate
- Documentation: ADR 0002, domain-identities module API/input-output/data-flow/
  lifecycle/persistence/recovery/capability/source-map sections, module registry
  and architecture Domain mapping added or updated