v0.1.6 — use_only enforcement completed for the wiki path (security)

• security (compile): a third-party inference (use_only) is no longer fed
  into the compiled wiki. recall() places the wiki in the gate's assertable
  GROUNDED block, so a use_only fact reaching the wiki could be asserted through
  the wiki path — even though gate.partition (0.1.3) already routed such inferences
  to UNVERIFIED. compile._grounded_inputs now excludes use_only edges, mirroring
  the gate; the inference still shapes behavior via recall's unverified channel, only
  kept out of the assertable body. Completes the 0.1.3 fix (which covered only the
  subgraph path). Adds a unit lock (test_grounded_inputs_excludes_use_only).