test(safe): add guard compatibility matrix

[makemake-kbo]

Summary

• pin Safe 1.3.0, 1.4.0, 1.4.1, and 1.5.0 and run one shared real-Safe lifecycle suite against each release
• verify owner-signed guard removal and regular Safe transactions are blocked before and at the fail-open threshold in healthy non-credible blocks, then succeed after expiry
• keep credible-block execution and registry-unavailability recovery as intentional pre-expiry paths
• colocate compatibility and operational tests under test/protection/safe/integration while retaining the dedicated legacy-pipeline profile and deployment tooling
• update CI and Safe compatibility documentation

Testing

• FOUNDRY_PROFILE=safe-guard forge test --offline --match-path test/protection/safe/integration/CredibleSafeGuardSafeIntegration.t.sol — 64 passed
• FOUNDRY_OFFLINE=true FOUNDRY_PROFILE=safe-guard pcl test — 79 passed
• FOUNDRY_OFFLINE=true FOUNDRY_PROFILE=ci pcl test --match-path test/protection/safe/** — 100 passed
• forge fmt --check test/protection/safe/integration
• git diff --check

[linear-code]

ENG-4049