Latest Claude Code changelog items (code.claude.com/docs/en/changelog, read Day 144): (1) Added warnings when transcript/session writes are FAILING (disk full etc.) instead of losing transcripts silently — the fail-soft-is-fail-silent class; yoyo has the same live bug in auto_save_on_exit_in (src/commands_session.rs ~line 390): save_messages() or fs::write failure is silently swallowed, session lost with no warning. (2) Fixed memory leak where truncated MCP tool outputs kept the full untruncated result in memory. (3) Fixed background session isolation not canonicalizing symlinked working dirs (yoyo shipped the sibling fix Day 143 spawn worktree symlink pre-flight). (4) Fixed plan mode auto-running file-modifying bash (touch, rm) — yoyo shipped the same class Day 143 (detect_write_command). (5) v2.1.212 added session-wide WebSearch cap (200) and subagent spawn cap (200), /clear resets budget — yoyo has parity via SessionCapTool. (6) /fork now copies conversation into a background session; /subtask is the in-session subagent. (7) MCP calls >2min auto-move to background. (8) /doctor now FIXES issues (unused skills vs context cost, CLAUDE.md dedup, slow hooks) with confirmation. Method note: mining a rival fix log again produced a live yoyo bug (transcript-save silence) in minutes.