feat: generate governed extension proposals from repeated evidence

tests/semantic_evolution/self_development_contract_test.go

@@ -2,6 +2,7 @@ package semantic_evolution_test
 
 import (
 	"testing"
+	"time"
 
 	"git.cin.su/m/Assistant/contracts/work"
 	workdomain "git.cin.su/m/Assistant/modules/work/domain"
@@ -13,3 +14,15 @@ func TestSelfDevelopmentRollbackIsAvailableOnlyFromCanary(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+func TestExtensionProposalIsProposalOnlyAndDeduplicatesSignals(t *testing.T) {
+	proposal, err := workdomain.BuildExtensionProposal([]work.ExtensionEvidence{{Ref: "gap-1", SignalKey: "printer-driver"}, {Ref: "gap-2", SignalKey: "printer-driver"}}, work.ExtensionProposalRequest{
+		ID: "proposal-printer", DesiredOutcome: "review printer adapter", SmallestChangeLayer: "capability-adapter", AffectedOwners: []string{"capability"}, AffectedContracts: []string{"CapabilityImplementation@v1"}, RiskTier: "C", EvaluationPlan: []string{"contract tests"}, Alternatives: []string{"retain capability gap"}, RollbackPlan: "disable candidate", Assumptions: []string{"human promotion"}, CreatedAt: time.UnixMilli(7),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if proposal.Stage != work.ExtensionProposalProposed || len(proposal.DeduplicatedSignalKeys) != 1 {
+		t.Fatalf("unexpected proposal stage/keys: %+v", proposal)
+	}
+}