Add tasks: the crew's shared to-do list

Bots and workspaces each keep a list of work tracked until it's done, and
the bots move it along themselves as they work.

- tasks (one collection per bot or per workspace), task_notes (the
  progress log) and task_media (a deliverable or a reference file, its
  bytes a private media row served at /media/private/<id>)
- statuses todo/doing/blocked/done/cancelled, with blocked_reason while
  only the user can unblock it
- visibility as SQL in src/utils/task-access: a user's own bots and
  workspaces, a run's own list plus its workspaces, everything for the
  coordinator; every tool and endpoint resolves through it
- list_tasks, create_task and update_task on every run, so a chat reply,
  a task and a routine all read the list, log progress and file what they
  produced
- TasksNote on every run and TaskReminderNote in chat, so a greeting or a
  proposed next step brings pending work up in one measured line
- tasks group on the workspace dashboard and a tasks modal in the
  conversation header, sharing one form, row and detail panel
- a bot's or workspace's own chat uploads are read before the delete so
  none are stranded; bot files keep their folder

Also corrects the README's RAM guidance and table alignment.

src/data/app-data.ts

@@ -194,6 +194,22 @@ export const AppData = {
      * Due schedules queued per tick of the `run-cron-jobs` cron.
      */
     CronJobBatchSize: 50,
+    /**
+     * Tasks (the crew's to-do list, `tasks`): the longest title, brief and
+     * note, how many one bot or workspace can hold, and how many files one
+     * task carries.
+     */
+    TaskTitleMaxLength: 120,
+    TaskDescriptionMaxLength: 8000,
+    TaskNoteMaxLength: 2000,
+    TaskMaxPerScope: 200,
+    TaskMediaMaxPerTask: 20,
+    /**
+     * Open tasks a chat reply carries as a digest for its reminder, and how
+     * many `list_tasks` hands back at once.
+     */
+    TaskReminderDigestCount: 3,
+    TaskListToolLimit: 20,
     /**
      * Automatic model picks (`rankAutoModels`). A free model from outside
      * `AutoModelVendorPreference` must have at least this much context, and