docs: sync to Claude Code v2.1.220

Bumps tutorial coverage from the v2.1.217 baseline (2026-07-22 sync) to
v2.1.220 — three contiguous releases (v2.1.218–v2.1.220).

Critical fixes:

- Nested subagent spawning is on by default again at depth 3 (v2.1.219).
  Five locations across 04-subagents, CATALOG, 10-cli and QUICK_REFERENCE
  stated it was disabled by default — true for v2.1.217–v2.1.218 only.
  CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH=1 now disables rather than enables.
  All five carry an identical three-era history note.
- Claude Opus 5 is the default Opus model (v2.1.219). 10-cli asserted
  "Opus 4.8 remains the default"; Opus 5 was absent from every model table.
  Added to both model tables, 19 Compatible Models footers, and ~20
  effort-level enumerations.

Also fixed: fast-mode model list, auto-mode eligibility self-contradiction
in 09-advanced-features, stale CLAUDE_CODE_ENABLE_AUTO_MODE opt-in in
CATALOG, hook-event count disagreement (29/30 -> 31 across three files),
doc-generator skill name/directory mismatch, stale "May 2026" headings,
and the last three docs.anthropic.com links.

Added: DirectoryAdded hook, /deep-research explicit-invocation note,
/code-review background subagent, context:fork background default, agent
frontmatter hook workspace trust, dynamic workflow size guideline and
workflowSizeGuideline key, sandbox.network.strictAllowlist, MCP error
surfacing, stream-json nested subagent forwarding, frontmatter boolean
values, agent name ':' rejection, auto/plan-mode classifier changes, and
Opus 5 safety-classifier fallback.

Renamed the deep-research skill example to topic-research to stop it
shadowing the built-in; mirrored to vi/ja/uk. doc-generator rename
mirrored to ja/zh/uk.

07-plugins/README.md

@@ -1125,8 +1125,8 @@ The following Claude Code features work together with plugins:
 
 ---
 
-**Last Updated**: July 11, 2026
-**Claude Code Version**: 2.1.206
+**Last Updated**: July 29, 2026
+**Claude Code Version**: 2.1.220
 **Sources**:
 - https://code.claude.com/docs/en/plugins
 - https://code.claude.com/docs/en/changelog#2-1-172
@@ -1142,4 +1142,5 @@ The following Claude Code features work together with plugins:
 - https://github.com/anthropics/claude-code/releases/tag/v2.1.142
 - https://github.com/anthropics/claude-code/releases/tag/v2.1.143
 - https://code.claude.com/docs/en/cli-reference
-**Compatible Models**: Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5
+- https://code.claude.com/docs/en/model-config
+**Compatible Models**: Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5

07-plugins/devops-automation/README.md

@@ -108,10 +108,11 @@ Result:
 
 ---
 
-**Last Updated**: July 18, 2026
-**Claude Code Version**: 2.1.212
+**Last Updated**: July 29, 2026
+**Claude Code Version**: 2.1.220
 **Sources**:
 - https://code.claude.com/docs/en/plugins
 - https://github.com/anthropics/claude-code/releases/tag/v2.1.131
 - https://github.com/anthropics/claude-code/releases/tag/v2.1.138
-**Compatible Models**: Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5
+- https://code.claude.com/docs/en/model-config
+**Compatible Models**: Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5

07-plugins/documentation/README.md

@@ -120,10 +120,11 @@ export GITHUB_TOKEN="your_github_token"
 
 ---
 
-**Last Updated**: July 18, 2026
-**Claude Code Version**: 2.1.212
+**Last Updated**: July 29, 2026
+**Claude Code Version**: 2.1.220
 **Sources**:
 - https://code.claude.com/docs/en/plugins
 - https://github.com/anthropics/claude-code/releases/tag/v2.1.131
 - https://github.com/anthropics/claude-code/releases/tag/v2.1.138
-**Compatible Models**: Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5
+- https://code.claude.com/docs/en/model-config
+**Compatible Models**: Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5

07-plugins/pr-review/README.md

@@ -92,10 +92,11 @@ Result:
 
 ---
 
-**Last Updated**: July 18, 2026
-**Claude Code Version**: 2.1.212
+**Last Updated**: July 29, 2026
+**Claude Code Version**: 2.1.220
 **Sources**:
 - https://code.claude.com/docs/en/plugins
 - https://github.com/anthropics/claude-code/releases/tag/v2.1.131
 - https://github.com/anthropics/claude-code/releases/tag/v2.1.138
-**Compatible Models**: Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5
+- https://code.claude.com/docs/en/model-config
+**Compatible Models**: Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5