docs: sync to Claude Code v2.1.278 (#183)

* docs: sync to Claude Code v2.1.278

Type: docs

Audit of the tutorial against Claude Code 2.1.278 (repo baseline was
2.1.263). Fixes claims the repo asserts that are now false; new-feature
coverage is English-only.

P0 - the repo stated the opposite of current behavior:
- AGENTS.md: the claude-md skill said Claude Code "does not read
  AGENTS.md directly" in all 5 languages. It has since v2.1.277, when no
  CLAUDE.md exists at or above the working directory.
- /output-style: listed as "Removed in v2.1.91" in 5 languages and in
  09-advanced-features. Re-added in v2.1.269; row moved out of the
  Deprecated Commands table.
- Permission rules: setup-auto-mode-permissions.py seeded Write(*),
  Glob(*) and NotebookEdit(*), which Claude Code accepts but never
  consults and warns about at startup. Removed; same fix in the
  config-examples.json profile and the 06/09 category tables.
- taskOutputMaxChars: documented as live. The TaskOutput tool was
  removed in v2.1.278 and the key is inert.

P1:
- Dynamic workflow "medium" guideline is fewer than 10 agents, not 15;
  the default is small on Pro plans since v2.1.271.
- Todo-tool availability restated as the official allowlist (Claude 3.x,
  Opus 4-4.7, Sonnet 4-4.6, Haiku 4.5) instead of a denylist; 23 sites
  across 5 languages.
- Memory hierarchy now notes the AGENTS.md fallback.
- Auto-mode classifier cost qualified: not charged on Enterprise plans
  and Claude API accounts since v2.1.278.

P3 (English only): full AGENTS.md section in 02-memory; omitClaudeMd
subagent field; plugin eval / --json / --accept-command / --marketplace;
maxEffortLevel, bashEditDiffEnabled, syncClaudeAi*, 4 env vars,
--system-prompt-snapshot, --plugin-dir folders; send-now key and Monitor
deadlines; checkpoints subagent-edit limitation.

Learning skills audited clean: 100 quiz questions and 100 Review
pointers all valid, 20 self-assessment options correctly mapped.

Cross-file anchors: 15 broken before, 15 after, 0 introduced.

* docs: address review — stale version stamps, /output-style re-add, permission tables

uk/README.md

@@ -443,7 +443,7 @@ chmod +x ~/.claude/hooks/*.sh
 **Події хуків** (33, у 4 категоріях) — коли він виконується:
 - **Хуки інструментів**: `PreToolUse`, `PostToolUse`, `PostToolUseFailure`, `PostToolBatch`, `PermissionRequest`, `PermissionDenied`
 - **Хуки сесій**: `SessionStart`, `Setup`, `SessionEnd`, `Stop`, `StopFailure`, `SubagentStart`, `SubagentStop`
-- **Хуки завдань**: `UserPromptSubmit`, `UserPromptExpansion`, `MessageDisplay`, `TaskCompleted`, `TaskCreated`, `TeammateIdle` (`TaskCompleted` і `TaskCreated` спрацьовують лише коли увімкнені todo-інструменти — типово вимкнені на Opus 4.8, Sonnet 5, Fable 5, Mythos 5 і новіших; `CLAUDE_CODE_ENABLE_TODO_TOOLS=1` повертає їх)
+- **Хуки завдань**: `UserPromptSubmit`, `UserPromptExpansion`, `MessageDisplay`, `TaskCompleted`, `TaskCreated`, `TeammateIdle` (`TaskCompleted` і `TaskCreated` спрацьовують лише коли увімкнені todo-інструменти — доступні типово тільки на Claude 3.x, Opus 4–4.7, Sonnet 4–4.6 та Haiku 4.5; `CLAUDE_CODE_ENABLE_TODO_TOOLS=1` повертає їх)
 - **Хуки життєвого циклу**: `ConfigChange`, `CwdChanged`, `DirectoryAdded`, `FileChanged`, `PreCompact`, `PostCompact`, `PreModelSwitch`, `PostModelSwitch`, `WorktreeCreate`, `WorktreeRemove`, `Notification`, `InstructionsLoaded`, `Elicitation`, `ElicitationResult`
 
 </details>
@@ -659,9 +659,10 @@ Claude:
 
 ---
 
-**Останнє оновлення**: 2 вересня 2026
-**Версія Claude Code**: 2.1.257
+**Останнє оновлення**: 19 вересня 2026
+**Версія Claude Code**: 2.1.278
 **Джерела**:
+- https://code.claude.com/docs/en/tools-reference#task-tool-availability
 - https://code.claude.com/docs/en/hooks
 - https://code.claude.com/docs/en/model-config
 **Сумісні моделі**: Claude Fable 5, Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5