Workbook v0.4.2

Quality and hardening for the web board, plus safety limits on task storage,
from nine reviewed pull requests.

Web board

• Saving a new task returns you to the board, and a Create more toggle
  keeps a clean form open for the next task instead (#41).
• New tasks land on the board optimistically: the card renders immediately
  while the save is still in flight, and a refused save offers the draft back
  instead of losing it (#46).
• Card descriptions are hidden by default to keep columns scannable; a board
  setting restores the previous behavior (#38).
• Labels are edited as removable chiclets instead of one comma-separated text
  field (#40).
• Tasks whose status matches no column appear in an explicit unknown-status
  section, matching the terminal board, instead of being hidden (#42).
• The dependency search popup closes when it loses focus (#47).

Limits and hardening

• Task fields are bounded — title 500 bytes, description 64 KiB, labels
  100 bytes each and 50 per task — and Workbook refuses to read a Git object
  over 4 MiB, so one oversized task can no longer exhaust memory in every
  clone. Web request bodies are capped at 1 MiB and the board server gains
  connection timeouts. The limits are documented in the README (#44).
• The web handler is built from a named options struct, and serve-level tests
  fail if the delete/restore or depend/free wirings are ever swapped (#43).

Performance and tooling

• The benchmark harness measures the agent hot loop (workbook next,
  workbook show), warm board reads, and the sync watcher's steady-state CPU
  and memory; a replacement api-update p95 target is proposed with evidence
  under docs/performance/ (#45).
• go test -short ./... is the supported fast suite for local iteration and
  parallel agents; the release and installer build tests share the ambient Go
  build cache instead of cold-compiling everything per test (#39).