docs: sync to Claude Code v2.1.170 (#140)

* docs: sync to Claude Code v2.1.170

Additive sync covering features shipped in v2.1.161-2.1.170. No breaking
changes in the window.

- 10-cli: add Claude Fable 5 model row (claude-fable-5); --safe-mode flag
  + CLAUDE_CODE_SAFE_MODE / CLAUDE_CODE_DISABLE_BUNDLED_SKILLS env vars;
  note --fallback-model now applies to interactive sessions (v2.1.166)
- 01-slash-commands: document /cd (preserves prompt cache, v2.1.169)
- 03-skills: document disableBundledSkills setting + env var (v2.1.169)
- 07-plugins: document /plugin list --enabled/--disabled (v2.1.163)
- 06-hooks: document Stop/SubagentStop additionalContext return (v2.1.163)
- 09-advanced-features: add Safe Mode + fallbackModel subsections
- 05-mcp: stdio servers receive CLAUDE_CODE_SESSION_ID on --resume (v2.1.161);
  add metadata footer (none existed)
- refresh footers on all edited files to 2.1.170 / June 10, 2026

* fix(mcp): correct CLAUDE_CODE_SESSION_ID --resume version to 2.1.163

05-mcp/README.md

@@ -118,6 +118,8 @@ Every MCP stdio server is spawned with `CLAUDE_PROJECT_DIR=<absolute path to rep
 
 Use this when your stdio server needs to read files relative to the project root regardless of where Claude Code was launched.
 
+stdio MCP servers also receive `CLAUDE_CODE_SESSION_ID` (matching the value passed to hooks and Bash), including when the session is resumed with `--resume` (v2.1.163+).
+
 ### SSE Transport (Deprecated)
 
 Server-Sent Events transport is deprecated in favor of `http` but still supported:
@@ -1168,8 +1170,8 @@ export GITHUB_TOKEN="your_token"
 
 ---
 
-**Last Updated**: June 2, 2026
-**Claude Code Version**: 2.1.160
+**Last Updated**: June 10, 2026
+**Claude Code Version**: 2.1.170
 **Sources**:
 - https://code.claude.com/docs/en/mcp
 - https://code.claude.com/docs/en/changelog