feat(promote-customer-spec): Phase B — two-picker SO line UX

Spec-side picker (x_fc_customer_spec_id / customer_spec_id) added on:
- sale.order.line (via quality inherit — onchange autofill, create()
  fallback to part default, _prepare_invoice_line carry)
- account.move.line (via quality inherit — invoice rendering)
- fp.part.catalog (via quality inherit — x_fc_default_customer_spec_id)
- fp.direct.order.line (via quality inherit — wizard picker + autofill)
- fp.direct.order.wizard (action_create_order post-creates spec on SO line)

Thickness picker switched to fp.recipe.thickness (replaces coating-scoped):
- sale.order.line.x_fc_thickness_id comodel + domain rewired to recipe
- account.move.line + fp.delivery same
- fp.direct.order.line.thickness_id same

View inherits in quality add Specification picker next to legacy
Primary Treatment column on:
- SO form line tree
- part catalog Default Treatments block
- direct-order wizard line tree + drawer

Wizard files (fp.contract.review.client.email.wizard) pulled from
entech into the repo — they were ahead of the repo. Quality __init__
now imports wizards/.

Legacy x_fc_coating_config_id + treatment_ids remain visible during
transition; Phase E removes them.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_configurator/wizard/fp_direct_order_line.py

@@ -60,6 +60,8 @@ class FpDirectOrderLine(models.Model):
              'workflow downstream — leaving this blank lets that path '
              'through.',
     )
+    # customer_spec_id is added by fusion_plating_quality (where
+    # fusion.plating.customer.spec lives).
     treatment_ids = fields.Many2many(
         'fp.treatment',
         string='Additional Treatments',
@@ -176,6 +178,8 @@ class FpDirectOrderLine(models.Model):
             # Pre-fill default treatments if any are configured.
             if not rec.treatment_ids and has_default_treatments:
                 rec.treatment_ids = [(6, 0, part.x_fc_default_treatment_ids.ids)]
+            # Default-spec auto-fill is implemented by an inherit in
+            # fusion_plating_quality (where customer_spec_id field lives).
             # New-part auto-suggest: if neither default exists, this is
             # likely a first-time use of the part. Auto-tick the
             # push_to_defaults toggle so whatever Sarah picks becomes
@@ -420,9 +424,9 @@ class FpDirectOrderLine(models.Model):
                 rec.serial_ids = [(4, rec.serial_id.id)]
     job_number = fields.Char(string='Job #')
     thickness_id = fields.Many2one(
-        'fp.coating.thickness',
+        'fp.recipe.thickness',
         string='Thickness',
-        domain="[('coating_config_id', '=', coating_config_id)]",
+        domain="[('recipe_id', '=', process_variant_id)]",
         ondelete='set null',
     )
 
@@ -442,11 +446,11 @@ class FpDirectOrderLine(models.Model):
                 and rec.quantity
             )
 
-    @api.onchange('coating_config_id')
-    def _onchange_coating_clears_thickness(self):
+    @api.onchange('process_variant_id')
+    def _onchange_recipe_clears_thickness(self):
         for rec in self:
             if (rec.thickness_id
-                    and rec.thickness_id.coating_config_id != rec.coating_config_id):
+                    and rec.thickness_id.recipe_id != rec.process_variant_id):
                 rec.thickness_id = False
 
     def action_generate_serial(self):

fusion_plating/fusion_plating_configurator/wizard/fp_direct_order_wizard.py

@@ -575,6 +575,8 @@ class FpDirectOrderWizard(models.Model):
                 'x_fc_internal_description': line.internal_description or False,
                 'x_fc_coating_config_id': line.coating_config_id.id,
                 'x_fc_treatment_ids': [(6, 0, line.treatment_ids.ids)],
+                # x_fc_customer_spec_id is added to vals by an extension
+                # of this method in fusion_plating_quality.
                 'x_fc_part_deadline': line.part_deadline,
                 'x_fc_part_deadline_offset_days': line.part_deadline_offset_days,
                 'x_fc_rush_order': line.rush_order,

fusion_plating/fusion_plating_configurator/wizard/fp_direct_order_wizard_views.xml

@@ -176,9 +176,9 @@
                                            optional="hide"/>
                                     <field name="thickness_id"
                                            options="{'no_quick_create': True}"
-                                           context="{'default_coating_config_id': coating_config_id}"
-                                           domain="[('coating_config_id', '=', coating_config_id)]"
-                                           invisible="not coating_config_id"
+                                           context="{'default_recipe_id': process_variant_id}"
+                                           domain="[('recipe_id', '=', process_variant_id)]"
+                                           invisible="not process_variant_id"
                                            optional="show"/>
                                     <field name="serial_ids"
                                            widget="many2many_tags"
@@ -196,7 +196,7 @@
                                     <field name="job_number" optional="hide"/>
                                     <field name="treatment_ids"
                                            widget="many2many_tags"
-                                           optional="hide"/>
+                                           invisible="1"/>
                                     <field name="quantity"
                                            optional="show"/>
                                     <field name="unit_price"