Kept boards had no delete path in the UI at all. The kept lane deliberately
omits the wipe control -- a one-click wipe next to the durable stuff is a
footgun -- but "deliberate" had been implemented as "impossible": the only
routes out were ssh or a hand-written API call.
Now it is two deliberate acts. A `release` control on kept cards drops the
sentinel, the board moves to the ephemeral lane, and the existing x wipes it
from there. Release is reversible -- POST /b/<name>/keep pins it again.
POST /b/<name>/unkeep release the pin
POST /b/<name>/keep pin it (round-trip, so release is not a one-way door)
FOUND WHILE TESTING, and it invalidates the previously-documented workaround:
removing the sentinel BUMPS the booth directory's mtime, and booth age is the
newest mtime in the tree -- so a released board's clock RESETS from 10,000s to
0s and it survives another full TTL. The old comment said "remove the sentinel
first (it rejoins the sweep)", which is true but means the board lives another
24h, not that it gets reaped. Unkeep-and-wait is a delay, not a delete.
test_releasing_a_board_RESETS_its_ttl_clock pins that behaviour deliberately so
nobody re-derives the workaround. Release is what unlocks the x; the x is what
deletes.
CLI: `booth rm` already worked on kept boards but said nothing about it. It now
announces "(was KEPT -- durable board)" so wiping something durable can never
look identical to wiping run output. Not a block -- a CLI user naming a booth
is being explicit.
5 new tests (67 pass). Verified live on nh3-dev: release renders on all four
kept boards, the ephemeral lane keeps its x, and the links board is untouched
with its sentinel intact.
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