docs: NexusFeature strategy notes and Master Plan v2

[Daliys]

Summary

Docs-only. Adds planning material under NexusFeature~/ (not compiled, not shipped in the package):

• NexusFeature~/ notes: MASTER_PLAN v1, ImageCapturePlan, benchmark v1 protocol/results/harnesses, AI session reports, Unity CLI video transcript, social feedback screenshots (from the first commit on this branch).
• NexusFeature~/MASTER_PLAN_V2.md (v2.2) — the new active plan. Nexus becomes a live-truth, verification and context layer on top of Unity CLI / Pipeline instead of competing on transport, tool count or raw speed.
  • Flagship "Live truth": nexus_snapshot, nexus_run, nexus_compile, nexus_look. nexus_verify is conditional on a competitor spike.
  • Pre-registered gates at week 4 (adoption) and week 9 (verify against the best competitor, Windows, external users).
  • Evidence-linked facts with expiry, verified code defects, GLOBAL RULES v2 for agent-run tasks.
  • §14b maps every planned item to what Unity ships now and is likely to ship next: use / wrap / build / avoid, plus integration hooks.
  • §15 is the adversarial review log.
• NexusFeature~/v2_analysis/: the source reports.
  • Four independent analyses.
  • Two adversarial challenges and the judge log.
  • Two Unity research reports.

Key findings recorded in the plan:

• v1 benchmark ok% counted protocol success rather than task success.
• ~100 ms latency steps come from Editor update throttling.
• Phase 0 code defects: unauthenticated shutdown_server, timed-out main-thread calls still executing, false-ready Move validation workflow to self-hosted Mac runner #13, fixed sleeps in the bridge compile wait, open-ended Pipeline versionDefines. The last one is urgent because Pipeline 0.8 moved [CliCommand] to Unity.Pipeline.Attributes.

No package source, tests, public docs or CI/linter configs are changed.

Validation

• Package compiles in Unity. n/a, no code changes.
• Relevant Editor tests pass. n/a. The Unity package smoke crash on this head is a pre-existing batch-mode ReadScreenPixel abort in development (see PR comments).
• NexusQualityGate passes or remaining warnings are intentional. n/a.
• Public/protected C# types and methods have useful XML documentation. n/a.
• Python bridge still compiles. n/a, bridge untouched.
• Public docs updated for behavior/API changes. n/a, no behavior change.
• CHANGELOG.md updated for public changes. n/a, internal planning docs only.

Pending: the owner's signed commit excluding NexusFeature~ from ruff and the code linter. The archived benchmark scripts are kept as they were run.

Safety checklist

• Server remains loopback/local-only. (unchanged)
• File operations remain constrained to the Unity project root. (unchanged)
• No generated caches, Python bytecode, .DS_Store, Unity Library/, or local agent artifacts included. The folder contains benchmark result JSON and screenshots by design; the owners decide whether NexusFeature~/ stays in the repo long-term.
• No secrets, credentials, private project source, or proprietary assets included. Auth token values are not in the result files; paths reference the owner's local machine.

🤖 Generated with Claude Code

https://claude.ai/code/session_01H6f4omZLV6CPXCnvhPr6Am

[Daliys]

CI blocker — needs a maintainer decision

• Python Quality Gate / Code Linter (head 46a00d7): failed on the archived benchmark scripts in NexusFeature~/bench/ and NexusFeature~/bench_nexus.py (34 ruff findings, 6 files unformatted, one 65-line main). The plan documents themselves are Markdown and not linted.
• I tried to fix this by excluding NexusFeature~ in .ruff.toml (eb8762b) and .code-linter.json (f4d728f). That was the wrong fix for this repo: the Code Linter's policy signature guard rejects both commits because linter configs are protected and require a signature from the code owner. Unsigned agent changes to them are blocked by design, so I am not going to work around it.

Options (owner to choose):

1. Drop eb8762b and f4d728f from the branch (force-push of agent-only commits) and make the same one-line exclusions yourself as a signed commit. This keeps the evidence scripts byte-for-byte as they were run.
2. Drop those two commits and let the agent make the bench scripts lint-clean instead (ruff fixes + split main). This touches only non-protected files, but it changes the archived scripts.
3. Drop those two commits and remove the bench scripts (or all of NexusFeature~/) from this PR, keeping only the plan documents.

No re-run requested: the failure is deterministic until one of these is chosen.

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[Daliys]

Option 1 chosen: eb8762b and f4d728f are removed from the branch (force-push, head now f37da0e). .ruff.toml and .code-linter.json are identical to development again. Python Quality Gate / Code Linter will stay red on NexusFeature~/ scripts until the owner's signed exclusion commit lands.

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[Daliys]

CI status on f37da0e, for the record:

• Unity Quality Gate and Documentation quality AI failed at 07:03, both after exactly ~10 min, with empty check output and no downloadable logs (HTTP 404). Unity package smoke and Python unit tests have been queued since 06:53. This looks like the self-hosted runners being unavailable (jobs never started), not this PR: the diff is Markdown under NexusFeature~/ only, with no C# or public-doc changes. I can't re-run jobs from here; they need a re-run once the runners are back.
• Python Quality Gate / Code Linter: expected red until the signed NexusFeature~ exclusion lands (see above).

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[Daliys]

Unity package smoke on f37da0e did run this time and failed with a native Unity crash (Abort trap: 6) during the EditMode tests. It is not caused by this PR (Markdown under NexusFeature~/ only). It is a package bug in code already on development:

AgentToolingTests.UiCaptureWindowSnapshotReturnsRectHierarchyAndBestEffortImage → ui_capture_window_snapshot → EditorWindowPixelCapture.TryReadSurfacePixels → InternalEditorUtility.ReadScreenPixel → NSBitmapImageRep initWithCGImage throws an Objective-C exception → abort. The C# try/catch cannot catch it. The only guard is InternalEditorUtility.isApplicationActive (Editor/Capture/EditorWindowPixelCapture.cs:60), which can be true in -batchmode on the persistent macOS runner, so this will fail intermittently depending on runner focus.

Proposed fix (separate PR, not widening this one), before the isApplicationActive check:

if (Application.isBatchMode)
{
    NexusEditorLog.Warning(NexusLogCategory.UiAutomation,
        $"[MCP_SCREENSHOT] {windowName} surface capture skipped: no screen surface in batch mode.");
    return null;
}

The test already accepts PartialSuccess with a message, so it would pass. No fix exists yet; I can't re-run the job from here.

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