feat(clean-release): complete compliance redesign phases and polish tasks T047-T052

backend/src/services/clean_release/exceptions.py

@@ -0,0 +1,38 @@
+# [DEF:clean_release_exceptions:Module]
+# @TIER: STANDARD
+# @PURPOSE: Domain exceptions for clean release compliance subsystem.
+# @LAYER: Domain
+
+class CleanReleaseError(Exception):
+    """Base exception for clean release subsystem."""
+    pass
+
+class CandidateNotFoundError(CleanReleaseError):
+    """Raised when a release candidate is not found."""
+    pass
+
+class IllegalTransitionError(CleanReleaseError):
+    """Raised when a forbidden lifecycle transition is attempted."""
+    pass
+
+class ManifestImmutableError(CleanReleaseError):
+    """Raised when an attempt is made to mutate an existing manifest."""
+    pass
+
+class PolicyResolutionError(CleanReleaseError):
+    """Raised when trusted policy or registry cannot be resolved."""
+    pass
+
+class ComplianceRunError(CleanReleaseError):
+    """Raised when a compliance run fails or is invalid."""
+    pass
+
+class ApprovalGateError(CleanReleaseError):
+    """Raised when approval requirements are not met."""
+    pass
+
+class PublicationGateError(CleanReleaseError):
+    """Raised when publication requirements are not met."""
+    pass
+
+# [/DEF:clean_release_exceptions:Module]