Drop the plan state from the store and the assignments: migration 0108 and placement-only assignments (release 6, issue 1945 B9, B4)

internal/inventory/migrations/0108-the-plans-leave-the-store.sql

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+-- The tables of the delivery plans' machinery leave the store (novox/hq ADR 0539 §17, design 47 release 6, issue 1945).
+--
+-- A machine follows its wants and applies a module from the composition the controller writes for it (ADR 0539 §1, §2), so
+-- the controller keeps no record of what it sent, no counter of the assignments a send was composed from, no verdict of a
+-- gate that judged a build on its first machine and no measure of how long a plan's tier or a machine's apply took. This
+-- drops the four tables that kept them: declaration_send (0094), assignment_generation (0094), build_gate (0073) and duration
+-- (0066, 0075).
+--
+-- **It is one-way**: a controller older than this schema is refused by the put-back gate (the highest migration it carries is
+-- recorded by its version, issue 352). What stays: the node row and its columns (the digest of the last send, which the old
+-- reads of `status` still name until they go with their verbs), the bus step, the core box and the refused registrations.
+-- The function raise_assignment_generation and its triggers went with 0105.
+drop table if exists declaration_send;
+drop table if exists assignment_generation;
+drop table if exists build_gate;
+drop table if exists duration;