docs(confinement): add execution-scope path-set model with order_create example

[omwei-org]

Summary

This change introduces an explicit protected-effect path-set model and makes execution-scope coverage visible for the confinement documentation.

Key changes

• New section: Execution scope and path sets in docs/confinement.md
• Path classification: Distinguishes agent-side (enforceable/testable through confinement) vs deployment-side (declared boundaries whose coverage remains NOT ESTABLISHED unless independently observed) paths
• Worked example: Uses order_create as the protected effect with four declared paths (P1-P4)
• Coverage model: P1-P3 (agent-side) are ENFORCED/TESTED via existing confinement fixtures; P4 (deployment-side) is DECLARED/NOT ESTABLISHED (requires deployment-level observation)
• Test documentation: Maps existing confinement tests to the path-set model

Design rationale

The model explicitly distinguishes four different claims:

1. Authorization (existing cMCP mechanism)
2. Correlation (existing cMCP mechanism)
3. Observation (existing cMCP mechanism)
4. Complete mediation (new: addressed by path-set declaration)

This avoids conflating authorization with universal complete mediation. The model supports a scoped NON_BYPASSABILITY claim; it does NOT establish universal complete mediation.

Test plan

• Code compiles successfully
• Synchronous unit tests pass (25/25 in test_adapter.py)
• Async test failures are pre-existing infrastructure issue (missing pytest-asyncio)
• Linux Docker tests require CMCP_CONFINEMENT_IMAGE environment variable
• No new test files added; existing tests mapped to path-set model via docstrings

Related issues

• Addresses Define execution scope for protected effects and complete mediation #736 (execution scope for protected effects)
• Builds on Validate that agent egress cannot bypass configured release controls #659 (confinement validation)

Generated with Devin: https://devin.ai

[github-actions]

Thanks for this, @omwei-org. Closing it for now, and it is not about the change itself.

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[rajnisht7]

The PR direction looks good, but a few places overstate and needs to be tightened:

• “Addressed by declaring” - Declaring a path set only scopes the claim whereas it does not prove complete mediation. it can be stated directly
• order_create vs tests : P1–P3 are marked ENFORCED/TESTED for order_create, but the fixtures only uses synthetic tools and a canary. kindly call this an illustrative example of generic confinement coverage, not proof of order_create
• “All alternate paths” : That test only covers the paths this fixture exercises. it would be good to drop “all” (the limits section already says coverage is partial).
• Network mutation proves the tested escapes (TCP/IPv6/DNS), not every possible route to order_create. kindly narrow the wording.
• File write and subprocess - network are different paths. kindly split them or only claim what was tested
• Listing P1–P4 does not show the list is complete. it will be good to separate “this path was tested” from “the set is complete"
• If P4 is NOT ESTABLISHED, kindly state that overall claim for that effect is also NOT ESTABLISHED
• Logging / sink - Those are confinement checks, not order_create paths. it will be good to keep them out of P1–P3.
• Mutation tests : They show a control was necessary when removed. kindly dont treat them alone as full path coverage
• it would be nice to link or briefly define EABC NON_BYPASSABILITY(B,E)

[codecov-commenter]

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