docs: acceptance 314 step 8 reads task trails, so mosaic trail gets its argument (#1524)

Filbert's row 135 round 3 note 1: step 8 ran mosaic trail with no
argument, but the CLI takes <task|decision>. The step now lists the
tasks and reads each task's trail, which includes the decisions filed
under it and the spec commit each cites. Doc-only: no test reads
docs/acceptance/314.md.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/acceptance/314.md

@@ -114,12 +114,22 @@ bus schema.
 
 8. Change the spec in the Console editor: also print the commit. Save.
 
+   ```
+   mosaic tasks
+   mosaic trail <task>
+   ```
+
+   Run `mosaic trail` for each task from step 4 and each task made after
+   the save. A task's trail lists the decisions filed under it with the
+   spec commit each one cites; `mosaic trail <decision>` shows one in
+   full.
+
    Pass:
    - the save makes a new commit by Jason;
-   - `mosaic trail` shows no decision settled under the step 2 commit
-     reopened (REQ-DEC-6);
-   - `mosaic trail` shows new raises citing the new commit, and no
-     raise citing the step 2 commit accepted after the save;
+   - no decision settled under the step 2 commit is reopened on its
+     trail (REQ-DEC-6);
+   - the new raises cite the new commit on their trails, and no raise
+     citing the step 2 commit is accepted after the save;
    - pm and the CTO each answer the spec commit with an accept
      (REQ-PROJ-4).