usage: tautline product-dev-mode [-h] [--target TARGET] {on,off,status}

Product-dev mode: a per-checkout, auto-expiring declaration that a human is
doing product-manager work. INERT on its own -- the sibling standdown stands
down the latest-code baseline nag, the active-goal Stop-guard, and the fake-
monitor background-command guard while active. Every code-safety MERGE gate
and the plan-review ceremony stay ON, so enabling the mode can never ship
unreviewed code. `on` writes the gitignored .ai-work/PRODUCT_DEV_MODE.json
state file (stamped with a 240-minute TTL), `off` clears it, `status` reports
on/off and remaining TTL. --target is resolved to the adapter root first, so a
nested-subdir invocation is visible to a repo-root reader.

positional arguments:
  {on,off,status}  on: declare product-dev mode; off: clear it; status: report
                   on/off + remaining TTL.

options:
  -h, --help       show this help message and exit
  --target TARGET  Directory inside the checkout to act on (resolved to the
                   adapter root).
