docs: sync all tutorials with latest Claude Code docs (April 2026) (#56)

* docs: sync all tutorials with latest Claude Code official docs (April 2026)

Update 44 documentation files to reflect the latest Claude Code features
from code.claude.com. Key content changes include new slash commands
(/ultraplan, /powerup, /sandbox), deprecated command removals (/pr-comments,
/vim), corrected skill description budget (1%/8K), new hook events
(PermissionDenied, InstructionsLoaded, ConfigChange), expanded Agent Teams
section, new plugin components (LSP, bin/, settings.json), and new CLI
flags (--bare, --tmux, --effort, --channels). Added "Last Updated: April
2026" metadata footer to all documentation files.

* fix(docs): correct env var values and alphabetical ordering

- CLAUDE_CODE_NEW_INIT=true → =1 in 02-memory and 09-advanced-features
- CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=true → =1 in 09-advanced-features
- Fix /powerup vs /plugin alphabetical order in slash commands table

* fix(docs): correct env var values in locale files (vi, zh)

Propagate CLAUDE_CODE_NEW_INIT=true → =1 and
CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=true → =1 corrections
to Vietnamese and Chinese translations.

07-plugins/README.md

@@ -105,8 +105,9 @@ my-plugin/
 ├── hooks/                # Event handlers in hooks.json
 │   └── hooks.json
 ├── .mcp.json             # MCP server configurations
-├── .lsp.json             # LSP server configurations
-├── settings.json         # Default settings
+├── .lsp.json             # LSP server configurations for code intelligence
+├── bin/                  # Executables added to Bash tool's PATH while plugin is enabled
+├── settings.json         # Default settings applied when plugin is enabled (currently only `agent` key supported)
 ├── templates/
 │   └── issue-template.md
 ├── scripts/
@@ -533,7 +534,7 @@ GitHub and git sources support optional `ref` (branch/tag) and `sha` (commit has
 
 **Private repositories**: Supported via git credential helpers or environment tokens. Users must have read access to the repository.
 
-**Official marketplace submission**: Submit plugins to the Anthropic-curated marketplace for broader distribution.
+**Official marketplace submission**: Submit plugins to the Anthropic-curated marketplace for broader distribution via [claude.ai/settings/plugins/submit](https://claude.ai/settings/plugins/submit) or [platform.claude.com/plugins/submit](https://platform.claude.com/plugins/submit).
 
 ### Strict mode
 
@@ -941,3 +942,8 @@ The following Claude Code features work together with plugins:
 - [MCP Server Reference](https://modelcontextprotocol.io/)
 - [Subagent Configuration Guide](../04-subagents/README.md)
 - [Hook System Reference](../06-hooks/README.md)
+
+---
+**Last Updated**: April 2026
+**Claude Code Version**: 2.1+
+**Compatible Models**: Claude Sonnet 4.6, Claude Opus 4.6, Claude Haiku 4.5