feat(numbering): WO grouping by recipe + parent-derived bulk naming

Replaces x_fc_wo_group_tag grouping with resolved-recipe grouping.
Bare WO-<parent> when 1 recipe, WO-<parent>-NN zero-padded for N>1
ordered by min line sequence. fp.job inherits parent-numbered mixin
for the manual-add path; bulk SO-confirm sets names explicitly.

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

fusion_plating/fusion_plating/models/fp_job.py

@@ -51,7 +51,7 @@ class FpJob(models.Model):
             dt = pytz.UTC.localize(dt)
         return dt.astimezone(tz).strftime(fmt)
     _description = 'Work Order'
-    _inherit = ['mail.thread', 'mail.activity.mixin']
+    _inherit = ['mail.thread', 'mail.activity.mixin', 'fp.parent.numbered.mixin']
     # Sub 12d — state-aware sort. Active work bubbles to the top
     # (in_progress → confirmed/draft → on_hold → done → cancelled),
     # then high-priority first within each state, then nearest deadline.
@@ -389,12 +389,50 @@ class FpJob(models.Model):
                 continue
             job.current_step_id = False
 
+    # ------------------------------------------------------------------
+    # Parent-numbered mixin hooks (2026-05-12 numbering hierarchy)
+    # ------------------------------------------------------------------
+    def _fp_parent_sale_order(self):
+        return self.sale_order_id
+
+    def _fp_name_prefix(self):
+        return 'WO'
+
+    def _fp_parent_counter_field(self):
+        return 'x_fc_wo_count'
+
     @api.model_create_multi
     def create(self, vals_list):
+        """fp.job naming priority:
+        1. Caller-provided name (bulk SO-confirm path sets these explicitly).
+        2. Mixin parent-derived name (manual WO add to an existing SO).
+        3. Legacy fp.job sequence (standalone job, no SO link).
+        """
+        # Pass A: fall back to legacy 'New' sentinel for records that
+        # don't get a parent-derived name. The mixin's post-create
+        # _fp_assign_parent_name() will override 'New' once the record
+        # exists if a parent SO is reachable.
         for vals in vals_list:
-            if vals.get('name', _('New')) == _('New'):
-                vals['name'] = self.env['ir.sequence'].next_by_code('fp.job') or _('New')
-        return super().create(vals_list)
+            if not vals.get('name'):
+                vals['name'] = _('New')
+        records = super().create(vals_list)
+        # Pass B: any record that came through with 'New' (no explicit
+        # name from the bulk SO path) tries the parent-derived path,
+        # falling back to the legacy sequence if there's no parent SO.
+        for rec in records:
+            if rec.name and rec.name != _('New') and rec.name != 'New':
+                continue  # caller set an explicit name (e.g. bulk SO confirm)
+            if not rec._fp_assign_parent_name():
+                seq = self.env['ir.sequence'].next_by_code('fp.job') or _('New')
+                # Raw SQL — fp.job has no immutability guard yet in this
+                # task, but Task 11 will add one. Using SQL here keeps the
+                # fallback path consistent across all child models.
+                self.env.cr.execute(
+                    "UPDATE fp_job SET name = %s WHERE id = %s",
+                    (seq, rec.id),
+                )
+                rec.invalidate_recordset(['name'])
+        return records
 
     # ------------------------------------------------------------------
     # State machine — actions