Document the MNCS Harness repository rename

[epi13]

What changed

INTEGRATIONS.md and the README now point at MNCS Harness. Internal LocalHarnessAdapter / local-harness ABI names are unchanged.

This is part of the coordinated 2026-08 MNCS family alignment:

• MNCDS becomes the canonical development-specification home
• MNCS Harness is the public identity of the former epi13-local-harness repository
• public docs describe reusable operator infrastructure, not a particular laboratory
• Harness / Control / Fabric / Commons / Forge remain non-normative relative to MNCS

Suggested merge order: MNCDS, then MNCS, then Harness + Control, then Atlas and remaining docs PRs. They can also merge independently.

Coordinated PRs

• Import canonical MNCDS 0.1 material and standalone validator machine-native-complexity-development-specification#2
• Relocate MNCDS specification authority to the MNCDS repository machine-native-complexity-standard#64
• Identify the project as MNCS Harness with compatibility aliases mncs-harness#40
• Discover MNCS Harness first and sanitize operator examples mncs-control-mcp#20
• Split MNCS/MNCDS and document MNCS Harness as operator infrastructure mncs-atlas#5
• Use MNCS Harness naming and generic worker examples mncs-fabric#45
• Refer to MNCS Harness as the operator routing layer MNCS-Commons#16
• Document the MNCS Harness repository rename #11
• Point development-process authority at the independent MNCDS repository mncs-reference-studies#4

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