contracts/work/self_development.go

@@ -82,3 +82,48 @@ type ExtensionProposal struct {
 	Assumptions            []string
 	CreatedAtUnixMillis    int64
 }
+
+type DevelopmentScaffoldStage string
+
+const DevelopmentScaffoldSandboxed DevelopmentScaffoldStage = "SANDBOXED"
+
+// DevelopmentScaffoldRequest describes the boundary a later control plane
+// would use to create an isolated worktree. This value object itself performs
+// no checkout or filesystem operation.
+type DevelopmentScaffoldRequest struct {
+	ID                  string
+	ProposalRef         string
+	BaseRepoRevision    string
+	WorktreeRef         string
+	TaskIntent          string
+	Modules             []string
+	AllowedPaths        []string
+	ForbiddenPaths      []string
+	ProtectedPaths      []string
+	RequiredTests       []string
+	ArtifactLineageRefs []string
+	ProtectedMainAccess string
+	ProductionAccess    string
+	SecretAccess        string
+	CreatedAt           time.Time
+}
+
+// DevelopmentScaffold is a provenance-linked task-packet candidate. It has
+// no executable instruction, credential, checkout handle or authority grant.
+type DevelopmentScaffold struct {
+	ID                  string
+	Stage               DevelopmentScaffoldStage
+	ProposalRef         string
+	BaseRepoRevision    string
+	WorktreeRef         string
+	TaskIntent          string
+	Modules             []string
+	AllowedPaths        []string
+	ForbiddenPaths      []string
+	RequiredTests       []string
+	ArtifactLineageRefs []string
+	ProtectedMainAccess string
+	ProductionAccess    string
+	SecretAccess        string
+	CreatedAtUnixMillis int64
+}

dev/ACTIVE_TASK.json

@@ -1,5 +1,5 @@
 {
-  "task_file": "dev/tasks/DEV-000186-extension-proposal-generator.json",
-  "task_id": "DEV-000186",
+  "task_file": "dev/tasks/DEV-000187-scaffold-task-packet-candidate.json",
+  "task_id": "DEV-000187",
   "task_revision": 1
 }

dev/tasks/DEV-000187-scaffold-task-packet-candidate.json

@@ -0,0 +1,26 @@
+{
+  "task_id": "DEV-000187",
+  "task_revision": 1,
+  "architecture_revision": "ADR-0018",
+  "base_repo_revision": "a09a7e8",
+  "risk_tier": "E",
+  "intent": "Add a fail-closed typed scaffold candidate factory that produces an isolated task-packet descriptor without creating files, reading secrets, or accessing protected main/production.",
+  "requirement_ids": ["WP-602", "Scoped task packet candidate", "Isolated worktree provenance", "Protected path denial"],
+  "allowed_change_scope": {
+    "modules": ["work-agent-execution"],
+    "paths": ["contracts/work/self_development.go", "modules/work/domain/self_development.go", "modules/work/domain/self_development_test.go", "tests/semantic_evolution/self_development_contract_test.go", "dev/ACTIVE_TASK.json", "dev/tasks/DEV-000187-scaffold-task-packet-candidate.json"]
+  },
+  "forbidden_change_scope": {"paths": ["architecture/**", "security/**", "database/**", "cmd/**", "adapters/**", "deploy/**", "contracts/authority/**", ".gitea/**"]},
+  "allowed_architecture_delta": {"new_cross_module_dependencies": 0, "new_canonical_owners": 0, "new_privileges": 0, "new_third_party_dependencies": 0, "new_database_owner_roles": 0},
+  "contracts": {"consume": ["Existing ExtensionProposal", "ADR-0022 governed development boundary"], "may_change": ["typed Work scaffold candidate value objects"]},
+  "semantic_owner": "work-agent-execution",
+  "canonical_state": ["No durable state; isolated scaffold candidate value object only"],
+  "state_transitions": ["proposal -> SANDBOXED task-packet candidate", "invalid scope/policy -> rejected result"],
+  "side_effects_and_privileges": ["No filesystem mutation, source checkout, secret access, provider call, deployment, promotion, or authority expansion"],
+  "persistence_and_migrations": ["No schema or migration changes"],
+  "failure_retry_restart": ["Deterministic validation is rerunnable; invalid or protected scope fails closed"],
+  "assumptions": ["A later external development control plane performs actual worktree creation", "Human governance remains promotion authority"],
+  "acceptance_scenarios": ["valid proposal produces scoped SANDBOXED descriptor", "absolute/traversal/protected path is rejected", "production and secret access policies must be DENIED", "missing provenance or test plan is rejected", "descriptor contains no command or credential material"],
+  "required_tests": ["go test ./modules/work/domain ./tests/semantic_evolution", "go vet ./...", "go run ./cmd/devctl preflight -task dev/tasks/DEV-000187-scaffold-task-packet-candidate.json", "go run ./cmd/devctl check-diff -task dev/tasks/DEV-000187-scaffold-task-packet-candidate.json", "go run ./cmd/devctl check-architecture", "go run ./cmd/devctl independent", "git diff --check", "CI"],
+  "terminal_gap_states": ["BLOCKED_BY_ARCHITECTURE_GAP", "BLOCKED_BY_SPEC_GAP", "BLOCKED_BY_CONFLICT"]
+}

modules/work/domain/self_development.go

@@ -11,6 +11,7 @@ import (
 var ErrInvalidDevelopmentGate = errors.New("invalid governed self-development gate")
 var ErrInsufficientExtensionEvidence = errors.New("insufficient repeated extension evidence")
 var ErrInvalidExtensionProposal = errors.New("invalid extension proposal")
+var ErrInvalidDevelopmentScaffold = errors.New("invalid development scaffold candidate")
 
 // BuildExtensionProposal deterministically turns a repeated evidence signal
 // into a proposal. It retains every distinct evidence reference for lineage,
@@ -86,6 +87,64 @@ func cleanStrings(values []string) []string {
 	return result
 }
 
+// BuildDevelopmentScaffold creates only a typed, isolated candidate. The
+// caller supplies the protected path set so this domain function cannot infer
+// or widen repository authority from ambient process state.
+func BuildDevelopmentScaffold(request work.DevelopmentScaffoldRequest) (work.DevelopmentScaffold, error) {
+	modules := cleanStrings(request.Modules)
+	allowed := cleanPaths(request.AllowedPaths)
+	forbidden := cleanPaths(request.ForbiddenPaths)
+	protected := cleanPaths(request.ProtectedPaths)
+	tests := cleanStrings(request.RequiredTests)
+	lineage := cleanStrings(request.ArtifactLineageRefs)
+	if request.ID == "" || request.ProposalRef == "" || strings.TrimSpace(request.BaseRepoRevision) == "" || strings.TrimSpace(request.WorktreeRef) == "" || strings.TrimSpace(request.TaskIntent) == "" || request.CreatedAt.IsZero() || len(modules) == 0 || len(allowed) == 0 || len(tests) == 0 || len(lineage) == 0 || request.ProtectedMainAccess != "DENIED" || request.ProductionAccess != "DENIED" || request.SecretAccess != "DENIED" {
+		return work.DevelopmentScaffold{}, ErrInvalidDevelopmentScaffold
+	}
+	for _, path := range allowed {
+		if unsafePath(path) || pathMatchesAny(path, forbidden) || pathMatchesAny(path, protected) {
+			return work.DevelopmentScaffold{}, ErrInvalidDevelopmentScaffold
+		}
+	}
+	worktree := strings.ToLower(strings.TrimSpace(request.WorktreeRef))
+	if worktree == "main" || worktree == "protected-main" || worktree == "production" {
+		return work.DevelopmentScaffold{}, ErrInvalidDevelopmentScaffold
+	}
+	return work.DevelopmentScaffold{ID: request.ID, Stage: work.DevelopmentScaffoldSandboxed, ProposalRef: request.ProposalRef, BaseRepoRevision: strings.TrimSpace(request.BaseRepoRevision), WorktreeRef: strings.TrimSpace(request.WorktreeRef), TaskIntent: strings.TrimSpace(request.TaskIntent), Modules: modules, AllowedPaths: allowed, ForbiddenPaths: forbidden, RequiredTests: tests, ArtifactLineageRefs: lineage, ProtectedMainAccess: "DENIED", ProductionAccess: "DENIED", SecretAccess: "DENIED", CreatedAtUnixMillis: request.CreatedAt.UnixMilli()}, nil
+}
+
+func cleanPaths(values []string) []string {
+	result := make([]string, 0, len(values))
+	seen := make(map[string]struct{}, len(values))
+	for _, value := range values {
+		value = strings.TrimSpace(strings.ReplaceAll(value, "\\", "/"))
+		if value == "" {
+			continue
+		}
+		if _, ok := seen[value]; ok {
+			continue
+		}
+		seen[value] = struct{}{}
+		result = append(result, value)
+	}
+	return result
+}
+
+func unsafePath(path string) bool {
+	return strings.HasPrefix(path, "/") || strings.HasPrefix(path, "~") || (len(path) > 1 && path[1] == ':') || slices.Contains(strings.Split(path, "/"), "..")
+}
+
+func pathMatchesAny(path string, scopes []string) bool {
+	for _, scope := range scopes {
+		scope = strings.TrimSuffix(scope, "/")
+		scope = strings.TrimSuffix(scope, "**")
+		scope = strings.TrimSuffix(scope, "/")
+		if path == scope || strings.HasPrefix(path, scope+"/") {
+			return true
+		}
+	}
+	return false
+}
+
 func AdvanceDevelopmentGate(current work.DevelopmentGate, next work.DevelopmentStage) (work.DevelopmentGate, error) {
 	if err := ValidateDevelopmentGate(current); err != nil {
 		return work.DevelopmentGate{}, err

modules/work/domain/self_development_test.go

@@ -51,6 +51,22 @@ func TestBuildExtensionProposalRejectsSingleFailureAndIncompleteGovernance(t *te
 	}
 }
 
+func TestBuildDevelopmentScaffoldFailsClosedForProtectedScope(t *testing.T) {
+	base := work.DevelopmentScaffoldRequest{ID: "scaffold-1", ProposalRef: "proposal-1", BaseRepoRevision: "abc123", WorktreeRef: "worktree-1", TaskIntent: "add reviewed adapter", Modules: []string{"capability"}, AllowedPaths: []string{"modules/capability/**"}, ForbiddenPaths: []string{"security/**"}, ProtectedPaths: []string{"architecture/**", "deploy/**"}, RequiredTests: []string{"go test ./..."}, ArtifactLineageRefs: []string{"proposal-1"}, ProtectedMainAccess: "DENIED", ProductionAccess: "DENIED", SecretAccess: "DENIED", CreatedAt: time.UnixMilli(1)}
+	scaffold, err := BuildDevelopmentScaffold(base)
+	if err != nil || scaffold.Stage != work.DevelopmentScaffoldSandboxed {
+		t.Fatalf("valid scaffold rejected: %+v %v", scaffold, err)
+	}
+	base.AllowedPaths = []string{"deploy/docker-compose.prod.yml"}
+	if _, err := BuildDevelopmentScaffold(base); err != ErrInvalidDevelopmentScaffold {
+		t.Fatalf("protected path must fail closed, got %v", err)
+	}
+	base.AllowedPaths = []string{"modules/capability/../security"}
+	if _, err := BuildDevelopmentScaffold(base); err != ErrInvalidDevelopmentScaffold {
+		t.Fatalf("traversal path must fail closed, got %v", err)
+	}
+}
+
 func TestGovernedSelfDevelopmentRejectsSameProducerAndVerifier(t *testing.T) {
 	gate := work.DevelopmentGate{ID: "dev-1", Stage: work.DevelopmentIsolated, EvidenceRefs: []string{"obs-1"}, ProducerRunRefs: []work.AgentRunID{"same"}, VerifierRunRefs: []work.AgentRunID{"same"}, VerificationEvidence: "verify-1"}
 	if _, err := AdvanceDevelopmentGate(gate, work.DevelopmentVerified); err == nil {

tests/semantic_evolution/self_development_contract_test.go

@@ -26,3 +26,10 @@ func TestExtensionProposalIsProposalOnlyAndDeduplicatesSignals(t *testing.T) {
 		t.Fatalf("unexpected proposal stage/keys: %+v", proposal)
 	}
 }
+
+func TestDevelopmentScaffoldRequiresExplicitDeniedAccessPolicies(t *testing.T) {
+	_, err := workdomain.BuildDevelopmentScaffold(work.DevelopmentScaffoldRequest{ID: "s", ProposalRef: "p", BaseRepoRevision: "r", WorktreeRef: "isolated", TaskIntent: "test", Modules: []string{"work"}, AllowedPaths: []string{"modules/work/**"}, RequiredTests: []string{"go test ./..."}, ArtifactLineageRefs: []string{"p"}, ProtectedMainAccess: "DENIED", ProductionAccess: "DENIED", SecretAccess: "ALLOW", CreatedAt: time.UnixMilli(1)})
+	if err == nil {
+		t.Fatal("secret access must be denied explicitly")
+	}
+}