The board's double-claim warning counts only plans still in flight

[Tradebaas]

What changed and why

The board warned that a scope item is being worked on from 2 plans at once whenever two specs
named it, a finished one included. That is not what the sentence says, and not what a reader needs.
An item worth two rounds of work carries two specs forever, so the heads-up would stand for the
life of the project and teach the reader to skim the one place the board raises its voice.

Closing spec 011 made it concrete. SC-8 was shipped first by the archived baseline spec 000 and has
been owned by 011 since, both done, and no ordering of those two would ever clear the line. The
alternative on the table was dropping SC-8 from 000's Traces to:, which edits what the baseline
says it shipped; the owner chose to fix the gate instead, so the historical record stays as it was.

A later spec supersedes an earlier claim, which is ordinary history. The clash worth reporting is
two unfinished plans on one item, where nobody has decided yet who owns it. The warning now
counts only the specs that have not finished, and names those.

The item's own state is untouched: the furthest spec still wins, so an item one plan already
shipped keeps reading done while a second plan reworks it.

Evidence

• Three self-tests hold the rule from both sides: two unfinished plans still warn, a finished plan
  plus a later one in flight does not, and two finished plans are history rather than a clash.
• Two older fixtures paired a building spec with a done one to exercise the clash. That pairing
  is no longer one, so both moved to two unfinished specs rather than being deleted.
• On this repo: node checks/progress.mjs now prints no heads-up and still reads 12 of the 12
  things done, exit 0.
• Gates: check.mjs OK, progress 27 (25 before, three added, one rewritten), links 19, cockpit 21,
  code 35.

Scope

One gate and its suite. No document changes: docs/state/STATE.local.md is gitignored and carries
the decision on the maintainer side.

Traces-to: SC-10