Required check 'Dispatch path and outcome contracts' fails on main since the automation quarantine (#571)

[hyperpolymath]

Problem

scripts/tests/dispatch-paths.sh calls scripts/dispatch-runner.sh. Since #571 (fa1ec2a), the runner refuses every call with exit 78 (BLOCKED: repository directive enforcement is not qualified; dispatch is quarantined (including --dry-run)). The test treats that exit as a failure.

The context is required on main, and it is red on main head 8a4f983. Every PR therefore inherits a failing required check.

Evidence: PR #586, job 111852349821. The failure reproduces locally on origin/main.

Acceptance criteria

• Dispatch path and outcome contracts is green on main.
• The quarantine is not weakened. Either:
  • the contract test asserts the quarantine (exit 78 plus the BLOCKED message) for every dispatch path while enforcement is unqualified, or
  • it runs the path/outcome assertions through a test-only seam that cannot be reached in production.
• A planted control: removing the quarantine interlock makes the test fail. Without it, a green test proves nothing.
• docs/AUTOMATION-QUARANTINE.adoc records how the contract test behaves while dispatch is quarantined.

Deferral issue under AGENTS.md §5c item 3, filed from #586.