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/models/account_move_line.py

@@ -66,10 +66,12 @@ class AccountMoveLine(models.Model):
         help='Copied from sale.order.line.',
     )
     x_fc_thickness_id = fields.Many2one(
-        'fp.coating.thickness',
+        'fp.recipe.thickness',
         string='Thickness',
         help='Copied from sale.order.line for customer-facing invoice PDFs.',
     )
+    # x_fc_customer_spec_id is added by fusion_plating_quality (where
+    # fusion.plating.customer.spec lives).
     x_fc_revision_snapshot = fields.Char(
         string='Revision (snapshot)',
         help='Revision letter from the source SO line.',

fusion_plating/fusion_plating_configurator/models/fp_part_catalog.py

@@ -283,6 +283,8 @@ class FpPartCatalog(models.Model):
         help='Default coating applied when this part is dropped onto a '
              'direct order line. Updated when "Save as Default" is ticked.',
     )
+    # x_fc_default_customer_spec_id is added by fusion_plating_quality
+    # (where fusion.plating.customer.spec lives).
     x_fc_default_treatment_ids = fields.Many2many(
         'fp.treatment',
         relation='fp_part_catalog_default_treatment_rel',

fusion_plating/fusion_plating_configurator/models/sale_order_line.py

@@ -62,6 +62,9 @@ class SaleOrderLine(models.Model):
     x_fc_coating_config_id = fields.Many2one(
         'fp.coating.config', string='Primary Treatment',
     )
+    # x_fc_customer_spec_id is added by fusion_plating_quality (where
+    # fusion.plating.customer.spec lives). Configurator can't reference
+    # it directly without a circular dep.
     x_fc_treatment_ids = fields.Many2many(
         'fp.treatment', string='Additional Treatments',
     )
@@ -308,12 +311,11 @@ class SaleOrderLine(models.Model):
              'order confirmation; editable. Blank is allowed.',
     )
     x_fc_thickness_id = fields.Many2one(
-        'fp.coating.thickness',
+        'fp.recipe.thickness',
         string='Thickness',
         ondelete='set null',
-        domain="[('coating_config_id', '=', x_fc_coating_config_id)]",
-        help="Target coating thickness. Options come from the line's "
-             'coating configuration.',
+        domain="[('recipe_id', '=', x_fc_process_variant_id)]",
+        help="Target thickness. Options come from the line's recipe.",
     )
     x_fc_revision_snapshot = fields.Char(
         string='Revision (snapshot)',
@@ -481,6 +483,8 @@ class SaleOrderLine(models.Model):
             vals['x_fc_thickness_id'] = self.x_fc_thickness_id.id
         if self.x_fc_revision_snapshot:
             vals['x_fc_revision_snapshot'] = self.x_fc_revision_snapshot
+        # x_fc_customer_spec_id carry-over is handled by an
+        # extension in fusion_plating_quality (the field lives there).
         return vals
 
     @api.onchange('x_fc_part_catalog_id')
@@ -498,6 +502,9 @@ class SaleOrderLine(models.Model):
             if line.x_fc_part_catalog_id and line.x_fc_part_catalog_id.default_process_id:
                 line.x_fc_process_variant_id = line.x_fc_part_catalog_id.default_process_id
 
+    # Spec auto-fill onchange lives in fusion_plating_quality
+    # (the customer.spec model lives there, so the inherit must too).
+
     def _fp_clone_recipe_to_part(self):
         """Deep-copy the picked recipe onto this line's part if it isn't
         already scoped there. Returns the cloned (or unchanged) variant.
@@ -575,17 +582,17 @@ class SaleOrderLine(models.Model):
             'target': 'current',
         }
 
-    @api.onchange('x_fc_coating_config_id')
-    def _onchange_coating_clears_thickness(self):
-        """Clear the thickness picker when coating config changes.
+    @api.onchange('x_fc_process_variant_id')
+    def _onchange_recipe_clears_thickness(self):
+        """Clear the thickness picker when recipe changes.
 
-        The thickness options are scoped to the coating config; a value
-        carried over from a previous coating would fail its domain.
+        Thickness options are scoped to the recipe; a value carried over
+        from a previous recipe would fail its domain.
         """
         for line in self:
             if (line.x_fc_thickness_id
-                    and line.x_fc_thickness_id.coating_config_id
-                    != line.x_fc_coating_config_id):
+                    and line.x_fc_thickness_id.recipe_id
+                    != line.x_fc_process_variant_id):
                 line.x_fc_thickness_id = False
 
     def action_generate_serial(self):