Align ErrorResponse schema with actual text/plain error bodies (#122)

* Initial plan

* feat: add shared openapi sync workflow

Agent-Logs-Url: https://github.com/CenterForDigitalHumanities/TinyNode/sessions/cf70963e-0b89-4625-9d20-10949e9b6dc2

Co-authored-by: cubap <1119165+cubap@users.noreply.github.com>

* changes

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: cubap <1119165+cubap@users.noreply.github.com>

Author: 3 people

openapi/components/tinynode-shared-components.openapi.yaml

@@ -91,15 +91,8 @@ components:
               minimum: 0
           additionalProperties: true
     ErrorResponse:
-      type: object
-      description: Generic error envelope used across operations.
-      properties:
-        message:
-          type: string
-        error:
-          type: string
-        status:
-          type: integer
-          minimum: 100
-          maximum: 599
-      additionalProperties: true
+      description: >-
+        TinyNode emits plain-text error bodies (Content-Type: text/plain). The
+        response body is the error message string; the HTTP status code carries
+        the category. Consumers should not expect a structured JSON envelope.
+      type: string

test/routes/mount.test.js

@@ -65,7 +65,9 @@ describe("Check to see that critical repo files are present", () => {
     assert.equal(fs.existsSync(`${filePath}README.md`), true)
     assert.equal(fs.existsSync(`${filePath}.gitignore`), true)
     assert.equal(fs.existsSync(`${filePath}package.json`), true)
-    assert.equal(fs.existsSync(`${filePath}.github/workflows/shared_openapi_sync.yaml`), true)
-    assert.equal(fs.existsSync(`${filePath}openapi/components/tinynode-shared-components.openapi.yaml`), true)
+    assert.equal(fs.existsSync(`${filePath}.github/workflows/shared_openapi_sync.yaml`), true,
+      "shared_openapi_sync.yaml workflow is missing — the receiver repo will stop receiving updates")
+    assert.equal(fs.existsSync(`${filePath}openapi/components/tinynode-shared-components.openapi.yaml`), true,
+      "canonical shared OpenAPI artifact is missing — sync workflow has nothing to publish")
   })
 })