SEP-018: Missing tests for standalone script state isolation after token rotation

[samudzi]

Summary

No test covers the scenario: (1) approve plan in session A, (2) simulate SessionStart token rotation, (3) call restore_approval.sh, (4) verify it finds the plan. This is the exact failure mode identified in SEP-012.

Motivation

test_hooks.sh has extensive scenario coverage but doesn't test cross-session state persistence for standalone scripts. The token rotation bug (SEP-012) would have been caught if this test existed.

Proposed Change

Add test cases to test_hooks.sh (or a new test file) covering:

• Approve plan in session A
• Simulate SessionStart token rotation (write new token to MEMORY.md)
• Call restore_approval.sh and verify it finds the plan from session A
• Call accept_outcome.sh and verify it can complete the workflow

Acceptance Criteria

• Test exists that covers cross-session state persistence
• Test fails if SEP-012 bug is present (regression test)
• Test passes after SEP-012 fix is applied

Related

• Depends on: SEP-012