[T615] Fix partial-mutation blocked outcome rendering

[ai21z]

Summary

• disclose successful mutation targets when an action-obligation block happens after a file was already changed
• remove stale blanket no-approval/no-file-changed wording from those partial-mutation blocked answers
• preserve the existing no-file-changed wording for true pre-mutation blocks

Verification

• RED: ExecutionOutcomeTest.blockedActionObligationAfterSuccessfulMutationDisclosesChangedTarget failed before implementation
• ./gradlew.bat test --tests "dev.talos.cli.modes.ExecutionOutcomeTest" --no-daemon
• ./gradlew.bat test --tests "dev.talos.runtime.outcome.MutationFailureAnswerRendererTest" --no-daemon
• ./gradlew.bat test --tests "dev.talos.runtime.toolcall.PendingActionObligationBreachGuardTest" --no-daemon
• ./gradlew.bat test --tests "dev.talos.runtime.outcome.*" --no-daemon
• git diff --check
• ./gradlew.bat validateArchitectureBoundaries --no-daemon
• ./gradlew.bat check --no-daemon