feat: generate governed extension proposals from repeated evidence

contracts/work/self_development.go

@@ -1,5 +1,7 @@
 package work
 
+import "time"
+
 type DevelopmentStage string
 
 const (
@@ -27,3 +29,56 @@ type DevelopmentGate struct {
 	PromotionRef         string
 	RollbackRef          string
 }
+
+// ExtensionProposalStage is deliberately proposal-only in this contract. A
+// proposal does not authorize source changes, provider calls, deployment or
+// promotion; those stages require the existing governed development gate.
+type ExtensionProposalStage string
+
+const ExtensionProposalProposed ExtensionProposalStage = "PROPOSED"
+
+// ExtensionEvidence is an immutable reference to an observation that points
+// at a repeated or corroborated improvement signal. The payload is owned by
+// its source module; Work stores only the typed reference and stable signal
+// key.
+type ExtensionEvidence struct {
+	Ref       string
+	SignalKey string
+}
+
+// ExtensionProposalRequest contains the operator/governance information
+// needed to decide whether an evidence pattern is worth reviewing. Empty
+// fields are rejected by the proposal generator rather than inferred.
+type ExtensionProposalRequest struct {
+	ID                  string
+	DesiredOutcome      string
+	SmallestChangeLayer string
+	AffectedOwners      []string
+	AffectedContracts   []string
+	RiskTier            string
+	EvaluationPlan      []string
+	Alternatives        []string
+	RollbackPlan        string
+	Assumptions         []string
+	CreatedAt           time.Time
+}
+
+// ExtensionProposal is a bounded, evidence-bearing candidate for governed
+// development. It intentionally contains no executable command, credential,
+// authority grant, implementation body or promotion decision.
+type ExtensionProposal struct {
+	ID                     string
+	Stage                  ExtensionProposalStage
+	EvidenceRefs           []string
+	DeduplicatedSignalKeys []string
+	DesiredOutcome         string
+	SmallestChangeLayer    string
+	AffectedOwners         []string
+	AffectedContracts      []string
+	RiskTier               string
+	EvaluationPlan         []string
+	Alternatives           []string
+	RollbackPlan           string
+	Assumptions            []string
+	CreatedAtUnixMillis    int64
+}