zagent 0.0.221

• Fenced code blocks in the TUI transcript now paint syntax colors —
  keyword/string/comment/number scopes across the common languages,
  pinned by a PTY oracle against the real render (TUI-CORE-SPEC W2).
• Streaming output commits only at newline boundaries and holds open
  GFM tables until they close — no more torn tables or duplicated
  scrollback lines mid-stream.
• zagent <cmd> --help now answers the command's usage row, flag
  notes, and an example: line for every routed verb instead of a
  one-line summary; passthrough verbs no longer leak the kernel's
  usage block.
• Unknown options mid-argv (zagent -p hi --efort low) are refused
  with exit 2 before the credential gate — previously they were
  swallowed as a sign-in card or the kernel's Usage: zcode. A
  bounded did-you-mean suggests the closest flag.
• -p --model on reasoning-required models (e.g. GLM-5.3) now embeds
  the catalog reasoningLevel so the provider accepts the turn instead
  of rejecting it.
• The offpeak ticket queue bounds requeues: retake-from-failed refuses
  past 3 attempts, so a crashed worker can no longer cycle a ticket
  forever.
• Internals: the new-user pipeline journey (fresh machine to first
  answer) joins the test gate, legacy-catalog tests are isolated from
  the host's provider config, and the F3 bots surface probe receipt is
  recorded for the parity ledger.