fix: restrict delegation scope, isolate test workspace, protect perstack.toml

[FL4TLiN3]

Summary

• Delegation scope: coordinator delegates restricted to write + verify only (remove direct access to review/test)
• perstack.toml protection: test explicitly instructs created expert not to touch perstack.toml
• Workspace isolation: test creates a dedicated work directory per run, reports its path to verify
• verify feedback target: CONTINUE fix recommendations must target perstack.toml (the expert definition), not the produced artifacts
• Bump to 1.0.24

Context

Production run showed:

1. create-expert delegated directly to test/review bypassing the write→verify flow
2. Generated expert's scaffold ran rm -rf perstack.toml
3. Test artifacts scattered across workspace root causing confusion
4. verify suggested changes to produced artifacts instead of the expert definition

Test plan

• Verify create-expert only delegates to write and verify
• Confirm test creates isolated work directory and reports its path
• Verify generated expert cannot delete perstack.toml
• Check verify's CONTINUE feedback references perstack.toml, not artifact internals

🤖 Generated with Claude Code