feat(create_project): add dispatch_allow to inject .dispatch-allow (#43)

Optional dispatch_allow bool (default false). When true, inject a
.dispatch-allow file at repo root on the resolved default branch after
substitution, marking the new project dispatch-eligible (dispatch#3)
without a manual follow-up commit.

Rides the existing upsertRetry path so injection inherits the infra#179
branch-readiness / partial_failure handling; a stalled injection degrades
exactly like substitution. Reported in files_substituted. false/omitted
is byte-for-byte unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/tools/create_project_from_template.go

@@ -48,7 +48,7 @@ func NewCreateProjectFromTemplate(c *gitea.Client, a *allowlist.Allowlist, tmplO
 func (t *CreateProjectFromTemplate) Descriptor() registry.ToolDescriptor {
 	return registry.ToolDescriptor{
 		Name:        "create_project_from_template",
-		Description: "Create a new project repo from a template. Best-effort substitution of placeholders (__PROJECT_NAME__, __MODULE_PATH__) in every file's content AND path (e.g. renaming cmd/__PROJECT_NAME__/): it completes only if the generated branch is promptly writable. If gitea's async generate is slow (infra#179) the repo is still created and partial_failure explains how to finalize locally (`hyperguild new-project`). Check files_substituted and partial_failure. Defaults to the server-configured template; pass template_name to override (e.g. template-go-agent).",
+		Description: "Create a new project repo from a template. Best-effort substitution of placeholders (__PROJECT_NAME__, __MODULE_PATH__) in every file's content AND path (e.g. renaming cmd/__PROJECT_NAME__/): it completes only if the generated branch is promptly writable. If gitea's async generate is slow (infra#179) the repo is still created and partial_failure explains how to finalize locally (`hyperguild new-project`). Check files_substituted and partial_failure. Defaults to the server-configured template; pass template_name to override (e.g. template-go-agent). Pass dispatch_allow=true to also inject a .dispatch-allow file so the project is immediately dispatch-eligible (dispatch#3).",
 		InputSchema: json.RawMessage(`{
 			"type":"object",
 			"properties":{
@@ -56,7 +56,8 @@ func (t *CreateProjectFromTemplate) Descriptor() registry.ToolDescriptor {
 				"name":{"type":"string","pattern":"^[a-z][a-z0-9-]{1,38}[a-z0-9]$"},
 				"description":{"type":"string"},
 				"private":{"type":"boolean"},
-				"template_name":{"type":"string","description":"Template repo name to generate from. Defaults to the server-configured template."}
+				"template_name":{"type":"string","description":"Template repo name to generate from. Defaults to the server-configured template."},
+				"dispatch_allow":{"type":"boolean","description":"When true, inject a .dispatch-allow file so the new project is immediately opt-in for headless dispatch (dispatch#3). Default false."}
 			},
 			"required":["owner","name"]
 		}`),
@@ -64,13 +65,20 @@ func (t *CreateProjectFromTemplate) Descriptor() registry.ToolDescriptor {
 }
 
 type createProjectArgs struct {
-	Owner        string `json:"owner"`
+	Owner         string `json:"owner"`
-	Name         string `json:"name"`
+	Name          string `json:"name"`
-	Description  string `json:"description"`
+	Description   string `json:"description"`
-	Private      bool   `json:"private"`
+	Private       bool   `json:"private"`
-	TemplateName string `json:"template_name"`
+	TemplateName  string `json:"template_name"`
+	DispatchAllow bool   `json:"dispatch_allow"`
 }
 
+// dispatchAllowContent is the body injected when dispatch_allow=true. Mirrors the
+// sandbox convention: presence of the file (not its content) marks the repo
+// dispatch-eligible; the comment exists only to explain that to a human reader.
+const dispatchAllowContent = "# Presence of this file marks this repo as opt-in for headless dispatch.\n" +
+	"# See dispatch#3.\n"
+
 type createProjectResult struct {
 	FullName         string   `json:"full_name"`
 	HTMLURL          string   `json:"html_url"`
@@ -176,6 +184,24 @@ func (t *CreateProjectFromTemplate) Call(ctx context.Context, raw json.RawMessag
 		}
 	}
 
+	// Opt the new project into headless dispatch if asked: presence of a
+	// .dispatch-allow file on the default branch marks it dispatch-eligible
+	// (dispatch#3). Ride the same upsertRetry path as substitution so it inherits
+	// the infra#179 branch-readiness / partial-failure handling below. Skip if the
+	// loop already stalled — a failed injection then degrades identically.
+	if args.DispatchAllow && result.PartialFailure == "" {
+		const dispatchAllowPath = ".dispatch-allow"
+		if err := t.upsertRetry(ctx, args.Owner, args.Name, dispatchAllowPath, gitea.UpsertFileArgs{
+			Branch:  branch,
+			Content: base64.StdEncoding.EncodeToString([]byte(dispatchAllowContent)),
+			Message: "dispatch: mark project dispatch-eligible (dispatch#3)",
+		}); err != nil {
+			result.PartialFailure = fmt.Sprintf("write %s: %v", dispatchAllowPath, err)
+		} else {
+			result.FilesSubstituted = append(result.FilesSubstituted, dispatchAllowPath)
+		}
+	}
+
 	// If substitution stalled because the generated branch wasn't writable in time,
 	// the repo IS created — say so clearly and point to the local finalize step,
 	// rather than leaking the raw "branch does not exist" (infra#179: gitea's

internal/tools/create_project_from_template_test.go

@@ -226,6 +226,38 @@ func TestCreateProject_WriteFailure_PartialFailure(t *testing.T) {
 	assert.Contains(t, out.PartialFailure, "go.mod")
 }
 
+// dispatch_allow injects a .dispatch-allow file (dispatch#3) only when true.
+func TestCreateProject_DispatchAllow(t *testing.T) {
+	tests := []struct {
+		name     string
+		argsJSON string
+		wantFile bool
+	}{
+		{"true injects .dispatch-allow", `{"owner":"mathias","name":"new-svc","dispatch_allow":true}`, true},
+		{"false does not inject", `{"owner":"mathias","name":"new-svc","dispatch_allow":false}`, false},
+		{"omitted does not inject", `{"owner":"mathias","name":"new-svc"}`, false},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			files := map[string]string{"go.mod": "module __MODULE_PATH__\n"}
+			f := newFakeTemplateServer(files, "main")
+			srv := httptest.NewServer(f.handler(t, "template-go-agent", "new-svc"))
+			defer srv.Close()
+
+			out := callTool(t, srv.URL, "template-go-agent", tc.argsJSON)
+			require.Empty(t, out.PartialFailure)
+			if tc.wantFile {
+				assert.Contains(t, out.FilesSubstituted, ".dispatch-allow")
+				assert.Contains(t, f.puts, ".dispatch-allow")
+				assert.Contains(t, f.putBodies[".dispatch-allow"], "dispatch#3")
+			} else {
+				assert.NotContains(t, out.FilesSubstituted, ".dispatch-allow")
+				assert.NotContains(t, f.puts, ".dispatch-allow")
+			}
+		})
+	}
+}
+
 // ── guardrails unchanged by the rewrite ──────────────────────────────────────
 
 func TestCreateProject_NameRegexFailure(t *testing.T) {