feat(run): crafter-review run and slots, the driver of the gates

Run: gate 0 (the artifact, the trees, the inventory, the run lock, the
scratch dir, dispositions, reuse state, resume, reads per round, seats,
the board), the stack and migration preflights, the prompts, reuse of
whole and block verdicts, salvage, a gate on the pool, checkpoints, the
dump, the dry-run report and the unit-state store; slots_plan and
app_ready beside it. The CLI parses run's 28 options, types and choices
included.

A full run takes its lifetime lock beside the board before it joins it.
A signal - or the stop file `crafter-review stop` writes, looked at
every 2 s - stops the run once gate 0 is through, and the stop stays in
force for the gates after; before that it ends the process with its
descendants.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

interfaces/Crafter.Review-SeatPool.cppm

@@ -66,6 +66,7 @@ export namespace Crafter::Review::SeatPool {
         Json MarkOut(const std::string& seatId, std::string_view reason, std::optional<double> now = std::nullopt);
         void Save();
         const Json& Data() const;
+        const std::filesystem::path& Path() const;
 
     private:
         std::filesystem::path path;