feat(using-tasks): v2.0.0 — .tasks/ board → mappa task-сущности (#983)

Борд = сущности type=task в сервисе (t:N, решение 20). Чтение — карв-аут
(entity_search), мутации под лизом (task_claim_next → claim_token, решение 19;
422 busy = чужой лиз — серверный аналог .tasks/.lock). claim/close/create/
heartbeat, notify-письмо при закрытии, локально-первая рекомендация. Файловый
.tasks/ — легаси; setup-tasks умер.

skills/using-tasks/README.md

@@ -4,8 +4,9 @@ Runtime policy for keeping compressed working context across parallel tasks
 in a monorepo. The agent reads and updates `.tasks/` so every session starts
 oriented and every switch costs seconds, not minutes.
 
-`using-tasks` governs *usage* of an existing `.tasks/`. Initial creation and
-migration to canon are owned by [`setup-tasks`](../setup-tasks/).
+`using-tasks` governs the task board. **Канал — mappa** (решение 14/15): борд =
+сущности `type=task` в сервисе (см. SKILL.md v2.0.0). Файловый `.tasks/` — легаси;
+`setup-tasks` умер.
 
 > Renamed from `task-status-wiki` at v1.0.0.
 
@@ -17,8 +18,8 @@ migration to canon are owned by [`setup-tasks`](../setup-tasks/).
   "update status".
 - Any context-switching or multi-task coordination question in a code
   project.
-- If `.tasks/` is missing or non-canonical, this skill delegates to
-  [`setup-tasks`](../setup-tasks/) before doing anything else.
+- Борд читается из mappa (`entity_search(type='task', project=…)`);
+  файловый `.tasks/` — легаси, ничего настраивать не нужно.
 
 ## Structure
 
@@ -70,8 +71,8 @@ hypotheses, links).
 
 ### Session start
 
-1. Check `.tasks/STATUS.md`. If missing → invoke
-   [`setup-tasks`](../setup-tasks/) and stop until it returns.
+1. Check the mappa board: `entity_search(type='task', project=<имя>)`.
+   Файлового `.tasks/STATUS.md` больше нет — setup-tasks умер.
 2. Read `STATUS.md`.
 3. If user names a task, read its `<task-slug>.md`.
 4. Confirm in one sentence: "We're in the middle of X, next step is Y."
@@ -163,7 +164,6 @@ Works on Windows under git-bash, Linux, macOS.
 
 ## See also
 
-- [`setup-tasks`](../setup-tasks/) — companion, owns `.tasks/` creation and
-  canon migration.
-- [`project-bootstrap`](../project-bootstrap/) — invokes `setup-tasks` for
-  new projects.
+- mappa — сервис-хост борда (`task_create`/`task_claim_next`/`task_close`,
+  per-type `t:N`).
+- [`project-bootstrap`](../project-bootstrap/) — mappa-режим для новых проектов.