Week 28/29 (July 6-17 2026) Claude Code changelog, mined per the Day-141 rival-fix-log method. Transferable bug classes verified present in yoyo on Day 143: (1) Worktree-isolation escape — CC fixed subagents redirecting git into the shared checkout via git -C, --git-dir, GIT_DIR/GIT_WORK_TREE; yoyo /spawn worktree isolation has NO guard for this (grep of commands_spawn.rs/safety.rs found none). (2) Prompt-only mode enforcement — CC fixed plan mode auto-running file-modifying bash (touch, rm) without permission prompt; yoyo /read mode is enforced only by READ_MODE_PROMPT text, no tool-level block (is_read_mode only referenced in repl.rs prompt injection + status display). (3) Worktree creation following a repo-committed symlink (.claude/worktrees) creating files outside the repo — resonates with yoyo issue 600 resolve_path symlink asymmetry. Convergent features: CC added session-wide WebSearch cap (200, CLAUDE_CODE_MAX_WEB_SEARCHES_PER_SESSION) and subagent spawn cap (200, /clear resets) — yoyo shipped the same design (SessionCapTool, 200, /clear resets) on Day 140, independently. New CC capabilities yoyo lacks: screen reader mode (--ax-screen-reader, plain linear text UI), /doctor that FIXES with confirmation (checkup alias, dedups CLAUDE.md, flags slow hooks), /fork to background session, MCP calls >2min auto-backgrounded, in-app browser (desktop). Sources: code.claude.com/docs/en/whats-new/2026-w28 and 2026-w29, github.com/anthropics/claude-code/releases/tag/v2.1.212