chore: scope OMP tools by subject

[zen-agents]

Change

• add the project-local OMP subject overlay
• keep global context7/time while suppressing out-of-subject design tools and skills
• enable the subject-specific MCP surface

Verification

• both committed files match the canonical machine-stack subject template byte-for-byte
• engineering suppression and Semgrep connectivity were exercised in a cold OMP pilot session

[greptile-apps]

Required label not found on this PR.

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