feat(jobs+receiving): confirm->receive flow, lock recipe, reset step, lock steps, fix bake gate

- Confirm->Receive (A): after a single interactive SO confirm, receiving's
  action_confirm returns action_view_receiving() so the user lands straight
  on the Receive Parts screen (opt-out via fp_no_receiving_redirect context).
- Lock recipe (1): recipe_id readonly on the WO form — stick to the
  order-entry recipe.
- Hide spec (2): customer_spec_id invisible on the WO form.
- Reset step (3): new fp.job.step.button_reset (operator-usable, audited) +
  an undo button next to Start. Resets to Ready, clears finish + sign-off,
  closes open timelogs, keeps start audit + move/CoC history.
- Lock steps (4): steps list create=false delete=false (no Add a line / no
  trash) — steps come from the recipe, only skippable, never deleted.
- Bake gate fix (5): _fp_missing_required_step_inputs now honours the node's
  collect_measurements master switch, matching the Record-Inputs wizard.
  collect_measurements=False + required prompts no longer blocks finish
  (wizard shows 0 rows, so the gate must too). Unblocks WO-30098 + 63 other
  affected nodes (bake steps).

Deployed + verified on entech (-u jobs; bake finishes, reset done->ready,
recipe readonly, spec hidden, steps locked, receiving redirect target OK).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_receiving/models/sale_order.py

@@ -74,6 +74,15 @@ class SaleOrder(models.Model):
                 'expected_qty':  int(total_qty),
                 'line_ids':      line_vals,
             })
+        # Seamless flow: after a single interactive confirm, jump straight
+        # to the Receive Parts screen so the dock counts parts in right away
+        # (idiot-proof — no hunting for the smart button). Guarded to a
+        # single order + an opt-out context flag so batch / programmatic
+        # confirms (and tests) keep the native return value.
+        if (len(self) == 1
+                and not self.env.context.get('fp_no_receiving_redirect')
+                and self.x_fc_receiving_ids):
+            return self.action_view_receiving()
         return res
 
     def action_view_receiving(self):