detect: expand agent ecosystem coverage

[RyshMan]

Problem

Wrkr needed broader deterministic coverage for agent ecosystems and stronger scenario/contract protection around agent policy outcomes, relationship correlation, and benchmark guardrails.

Changes

• Added new deterministic detectors for custom agent frameworks and MCP client usage.
• Expanded detector defaults/inventory aggregation and updated related detector/unit tests.
• Added scenario fixtures and scenario tests for agent policy outcomes and relationship correlation.
• Added benchmark schema, benchmark runner script, and benchmark fixtures/thresholds.
• Extended contract and workflow coverage with new story contract tests and CI workflow updates.

Validation

• make prepush-full

[chatgpt-codex-connector]

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