feat(claude-code-settings): sync to Claude Code v2.1.50

[miteshashar]

Schema

• Add ConfigChange hook event — fires when settings/skill files change during a session, with matcher support (user_settings, project_settings, local_settings, policy_settings, skills) and decision control via exit code 2, as per hooks documentation (v2.1.49)
• Add WorktreeCreate hook event — fires on --worktree or isolation: "worktree", hook prints absolute path to stdout, as per hooks documentation (v2.1.50)
• Add WorktreeRemove hook event — cleanup counterpart to WorktreeCreate, as per hooks documentation (v2.1.50)
• Update env description with CLAUDE_CODE_DISABLE_1M_CONTEXT and link to model-config docs (v2.1.50)
• Enhance fastMode description with research preview status and 2.5x speed per fast-mode docs
• Document availableModels merge/deduplicate behavior across settings levels per model-config docs
• Add managed settings hierarchy context to disableAllHooks per hooks docs (v2.1.49)
• Add descriptions to blockedMarketplaces source fields for coverage compliance
• Add additionalProperties: false to blockedMarketplaces anyOf variants, consistent with extraKnownMarketplaces and strictKnownMarketplaces

Tests

• Add ConfigChange, WorktreeCreate, WorktreeRemove hook examples to hooks-complete.json
• Add all three new hook events to modern-complete-config.json
• Add git source with .git URL to managed-settings.json blockedMarketplaces for pattern coverage

Negative tests

• Add invalid-blocked-marketplace-git-url.json for git URL pattern violation (missing .git suffix)
• Split invalid-managed-settings.json to isolate wrong_type violations only
• Split invalid-marketplace-host-pattern.json to isolate pattern_mismatch only
• Move strictKnownMarketplaces wrong_type test to wrong-property-types.json

Infrastructure

• Enable test coverage analysis for claude-code-settings.json with strict: true in CI

Skipped

• Per-event handler type restrictions (command-only events) — would require major schema refactoring for validation that runtime already enforces
• startupTimeout for LSP servers — not a settings.json property
• isolation: worktree for agents — Task tool parameter, not settings.json
• Plugin settings.json shipping — plugin manifest concern, not settings.json schema

🤖 Generated with Claude Code

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @domdomegg and @bogini - if they write a comment saying "LGTM" then it will be merged.

[domdomegg]

LGTM

[github-actions]

Merging because @domdomegg is a code-owner of all the changes - thanks!