docs: map ECS migration status and remaining work

[DrJKL]

Summary

Replace the in-progress ECS roadmap commentary with a concise implementation status and focused architecture audits.

Changes

• What: Documents completed and remaining migration work, adds decision traceability and dedicated authority, lifecycle, mutation, identity, compatibility, verification, and documentation audits, and provides an executive summary.

Review Focus

Validate that current implementation, transitional boundaries, and remaining work are separated accurately without changing ADR decisions.

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📝 Walkthrough

Walkthrough

The PR relocates the ECS migration plan and adds documentation covering migration status, state authority, lifecycle, identity, mutation, compatibility, verification, decision traceability, and documentation accuracy. Related ADR and architecture links now use the new path.

Changes

ECS documentation restructuring

Layer / File(s)	Summary
Migration status and plan docs/architecture/ecs/ecs-migration-plan.md, docs/architecture/ecs/ecs-migration-summary.md	Adds the current ECS migration state, ownership model, completed work, remaining boundaries, completion criteria, non-goals, and supporting references.
Architecture, identity, and lifecycle audits docs/architecture/ecs/ecs-state-authority-audit.md, docs/architecture/ecs/ecs-identity-scope-audit.md, docs/architecture/ecs/ecs-lifecycle-audit.md	Documents state ownership, identity scope, lifecycle ordering, cleanup, replacement behavior, and lifecycle hazards.
Mutation, compatibility, and verification audits docs/architecture/ecs/ecs-mutation-audit.md, docs/architecture/ecs/ecs-extension-compatibility-audit.md, docs/architecture/ecs/ecs-verification-audit.md	Records mutation guarantees, compatibility behavior, verification evidence, and remaining coverage gaps.
Traceability and documentation alignment docs/architecture/ecs/ecs-decision-traceability.md, docs/architecture/ecs/ecs-documentation-audit.md, docs/adr/*, docs/architecture/appendix-ecs-pattern-survey.md, docs/architecture/ecs-target-architecture.md, docs/architecture/output-slot-connectivity.md, docs/architecture/subgraph-boundaries-and-promotion.md	Adds traceability and documentation audits, removes the former migration-plan document, and updates references to docs/architecture/ecs/ecs-migration-plan.md.

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

Merge Risk: 🟡 Moderate · up to 4b094

The documentation currently overstates lifecycle cleanup and describes configuration ordering more strongly than the implementation supports, which could mislead future ECS migration work and design decisions. Correct these statements or obtain explicit owner acceptance before merging; the remaining issues are minor.

Possibly related PRs

• Comfy-Org/ComfyUI_frontend#15321: Adds ECS migration regression tests for documented lifecycle, geometry, identity, and compatibility behavior.
• Comfy-Org/ComfyUI_frontend#15327: Adds regression tests for ECS layout, reroute, replacement, and renderer behavior.

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Important

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
End-To-End Regression Coverage For Fixes	❓ Inconclusive	The changed files are documentation-only, but the actual PR title and commit subjects are not provided, so the required metadata check cannot be completed.	Provide the PR title and all commit subjects to determine whether the bug-fix language condition applies.

✅ Passed checks (6 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the primary change: documenting ECS migration status and remaining work.
Description check	✅ Passed	The description includes the required summary, changes, and review focus sections and accurately reflects the documentation-only scope.
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.
Website End-To-End Regression Coverage	✅ Passed	The changed files are documentation files only. No files under apps/website/src/ or apps/website/public/ changed, so this check does not apply.
Adr Compliance For Entity/Litegraph Changes	✅ Passed	The changed-file list contains only documentation files and link edits; no entity code, mutation APIs, god-object methods, component methods, or extension callbacks appear in the provided diff cont...

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/ecs-migration-audits

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[christian-byrne]

This is helpful. Can we put them into something like docs/architecture/ecs perhaps? For files that track current development process, gaps remaining, audits, etc. maybe a new folder that contains more temporary docs is warranted.

[christian-byrne]

Can you check https://github.com/Comfy-Org/comfy-multi-player

[DrJKL]

Spoilers...

[DrJKL]

Checked. Comfy-Org/comfy-multi-player implements the shared Yjs workflow document, stamped op applier, and canonical projection for the server-host/browser-follower model. I updated the traceability audit to distinguish that cross-repository contract from this frontend branch: the frontend does not yet depend on the package, and layout remains a separate frontend document by that package’s own contract.

[DrJKL]

This is helpful. Can we put them into something like docs/architecture/ecs perhaps? For files that track current development process, gaps remaining, audits, etc. maybe a new folder that contains more temporary docs is warranted.

docs/architecture/migration/*.md?

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Actionable comments posted: 4

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Inline comments:
In `@docs/architecture/ecs/ecs-lifecycle-audit.md`:
- Around line 47-51: Update LGraph.configure and normalizeConfiguredTopology so
complete recursive subgraph-definition normalization, including cross-definition
ID collision handling, occurs before root link registration and rerouting;
alternatively, explicitly document the staged ordering and add tests covering
collisions across definitions.

In `@docs/architecture/ecs/ecs-migration-summary.md`:
- Around line 19-20: Revise the lifecycle status claims in
docs/architecture/ecs/ecs-migration-summary.md lines 19-20 to limit “tears down
migrated state” to supported paths or explicitly name the known cleanup
exceptions recorded by the lifecycle audit. Also update the completed-work entry
in docs/architecture/ecs/ecs-migration-plan.md lines 39-40 so it does not imply
complete lifecycle cleanup; no code changes are needed.

In `@docs/architecture/ecs/ecs-state-authority-audit.md`:
- Around line 20-27: Update the architecture audit’s NodeState description to
call it “one store-backed NodeState” rather than “one plain NodeState,” and
explicitly note that inputs and outputs still contain NodeInputSlot and
NodeOutputSlot instances as a transitional exception.

In `@docs/architecture/output-slot-connectivity.md`:
- Line 7: Remove the extra closing parenthesis from the ECS migration plan
Markdown link so the reference ends with exactly one closing parenthesis.

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📥 Commits

Reviewing files that changed from the base of the PR and between 315f716 and 4b094ed.

📒 Files selected for processing (17)

• docs/adr/0003-crdt-based-layout-system.md
• docs/adr/0008-entity-component-system.md
• docs/architecture/appendix-ecs-pattern-survey.md
• docs/architecture/ecs-migration-plan.md
• docs/architecture/ecs-target-architecture.md
• docs/architecture/ecs/ecs-decision-traceability.md
• docs/architecture/ecs/ecs-documentation-audit.md
• docs/architecture/ecs/ecs-extension-compatibility-audit.md
• docs/architecture/ecs/ecs-identity-scope-audit.md
• docs/architecture/ecs/ecs-lifecycle-audit.md
• docs/architecture/ecs/ecs-migration-plan.md
• docs/architecture/ecs/ecs-migration-summary.md
• docs/architecture/ecs/ecs-mutation-audit.md
• docs/architecture/ecs/ecs-state-authority-audit.md
• docs/architecture/ecs/ecs-verification-audit.md
• docs/architecture/output-slot-connectivity.md
• docs/architecture/subgraph-boundaries-and-promotion.md

💤 Files with no reviewable changes (1)

• docs/architecture/ecs-migration-plan.md

Included review availability: 3 reviews are currently available. Based on recent review activity, included reviews refill at 4 per hour.

[DrJKL]

Addressed the organization feedback by moving the ten migration-status and audit references under docs/architecture/ecs/. Durable target documents such as ecs-target-architecture.md and ecs-lifecycle-scenarios.md remain at the architecture root; inbound links were updated.

[benjcooley]

Approving. Docs-only change targeting feature/ecs-migration — no code risk. The consolidation into docs/architecture/ecs/ addresses the folder-structure feedback, and the status write-up honestly separates what's shipped (nodeDataStore, linkStore, rerouteStore, widgetValueStore, Yjs layoutStore, badgeSystem) from what remains (command coverage beyond layout, cross-store transaction boundaries, snapshot-based undo/redo, class-based slots/widgets). CodeRabbit's actionable findings look addressed in b70a627/08ac408.