Simplify page view file loading to plain relative paths

api/openapi.yaml

@@ -875,15 +875,17 @@ paths:
         "404": { $ref: "#/components/responses/Error" }
         "409": { $ref: "#/components/responses/Error" }
 
-  /api/raw:
+  /api/tasks/{taskId}/raw:
+    parameters:
+      - { name: taskId, in: path, required: true, schema: { type: string } }
     get:
-      operationId: getRaw
+      operationId: getTaskRaw
       description: >
         A regular file on the server, whole, with a content type chosen by its extension: an HTML page in the
         app's Page view and the stylesheets, scripts and images it loads. The response carries a sandbox
         Content-Security-Policy, so a page opened from this address directly can't act on the API as its viewer.
       parameters:
-        - { name: path, in: query, required: true, schema: { type: string }, description: "Absolute and slash-separated." }
+        - { name: path, in: query, required: true, schema: { type: string }, description: "Slash-separated, absolute or relative to the task's worktree root." }
       responses:
         "200":
           description: The file's bytes.
@@ -891,6 +893,7 @@ paths:
             "*/*": { schema: { type: string, format: binary } }
         "400": { $ref: "#/components/responses/Error" }
         "404": { $ref: "#/components/responses/Error" }
+        "409": { $ref: "#/components/responses/Error" }
 
   /api/terminals:
     get: