feat(core): add inspection adapter poc

[afourniernv]

Summary

Add a small internal inspection adapter POC in NeMo Relay that maps LLM and tool interception flows into a shared allow/deny/mutate decision model. This is intended as a loose-coupling exploration alongside OpenShell runtime-boundary inspection, not a hard OpenShell integration.

Related Issue

• Related to [Enhancement]: add an optional neutral inspection adapter surface for OpenShell interoperability #277
• Related to docs(rfc): add loose inspection contract proposal OpenShell#1930
• Related to feat(supervisor-network): add request inspection seam poc OpenShell#1971

Changes

• Add a minimal inspection adapter module in crates/core/src/inspection.rs
• Export the adapter from crates/core/src/lib.rs
• Add focused unit tests for LLM/tool allow, deny, and mutate behavior

Testing

• mise run pre-commit passes
• Unit tests added/updated
• E2E tests added/updated (if applicable)

Local validation run:

• cargo test -p nemo-relay relay_inspection_adapter -- --nocapture

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)

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