feat(sub12b): fp.rack.tag — rack-label registry + 4 starter tags

M2M tag registry: Rush / Hold for QC / Damaged / Customer Sample.
Each rack can carry many tags; tags surface as coloured chips on the
plant-overview rack rows + Move Rack dialog (Task 13).

Plating → Configuration → Rack Tags menu (sequence 48).
post_init_hook seeds 4 starters — idempotent (no-op if any exist).

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

fusion_plating/fusion_plating/__init__.py

@@ -22,10 +22,12 @@ def post_init_hook(env):
        `kind` field.
     3. Sub 12a — seed fp.step.template with starter library entries
        derived from ENP-ALUM-BASIC if the library is currently empty.
+    4. Sub 12b — seed 4 starter rack tags if the registry is empty.
     """
     _seed_default_timezone(env)
     _backfill_node_input_kind(env)
     _seed_step_library_if_empty(env)
+    _seed_rack_tags_if_empty(env)
 
 
 def _seed_default_timezone(env):
@@ -185,3 +187,21 @@ def _seed_minimal_library(env):
         'Fusion Plating: seeded minimal step library (%s entries)',
         len(minimal),
     )
+
+
+def _seed_rack_tags_if_empty(env):
+    """Sub 12b — seed 4 starter rack tags."""
+    Tag = env['fp.rack.tag']
+    if Tag.search_count([]):
+        return
+    starters = [
+        ('Rush', 1),
+        ('Hold for QC', 3),
+        ('Damaged', 9),
+        ('Customer Sample', 5),
+    ]
+    for name, color in starters:
+        Tag.create({'name': name, 'color': color})
+    _logger.info(
+        'Fusion Plating: seeded %s starter rack tags', len(starters),
+    )

fusion_plating/fusion_plating/models/__init__.py

@@ -37,3 +37,6 @@ from . import fp_process_node_inherit
 from . import fp_step_template
 from . import fp_step_template_input
 from . import fp_step_template_transition_input
+
+# Sub 12b — Rack-aware moves + persistent labor reconciliation
+from . import fp_rack_tag

fusion_plating/fusion_plating/models/fp_rack_tag.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+# Part of the Fusion Plating product family.
+
+from odoo import fields, models
+
+
+class FpRackTag(models.Model):
+    """Operator-visible labels applied to physical racks.
+
+    "Rush" / "Hold for QC" / "Customer-Amphenol" / "Damaged" — the
+    coloured tag chips that appear in the Move Rack dialog and on the
+    plant-overview rack rows. M2M; one rack can carry many tags.
+    """
+    _name = 'fp.rack.tag'
+    _description = 'Fusion Plating — Rack Tag'
+    _order = 'sequence, name'
+
+    name = fields.Char(string='Tag', required=True, translate=True)
+    color = fields.Integer(string='Color')
+    sequence = fields.Integer(string='Sequence', default=10)
+    active = fields.Boolean(string='Active', default=True)
+    company_id = fields.Many2one(
+        'res.company', string='Company',
+        default=lambda self: self.env.company,
+    )
+
+    _sql_constraints = [
+        ('fp_rack_tag_name_company_uniq',
+         'unique(name, company_id)',
+         'Rack tag name must be unique within a company.'),
+    ]

fusion_plating/fusion_plating/security/ir.model.access.csv

@@ -70,3 +70,6 @@ access_fp_step_template_input_manager,fp.step.template.input.manager,model_fp_st
 access_fp_step_template_transition_input_operator,fp.step.template.transition.input.operator,model_fp_step_template_transition_input,group_fusion_plating_operator,1,0,0,0
 access_fp_step_template_transition_input_supervisor,fp.step.template.transition.input.supervisor,model_fp_step_template_transition_input,group_fusion_plating_supervisor,1,1,1,1
 access_fp_step_template_transition_input_manager,fp.step.template.transition.input.manager,model_fp_step_template_transition_input,group_fusion_plating_manager,1,1,1,1
+access_fp_rack_tag_operator,fp.rack.tag.operator,model_fp_rack_tag,group_fusion_plating_operator,1,0,0,0
+access_fp_rack_tag_supervisor,fp.rack.tag.supervisor,model_fp_rack_tag,group_fusion_plating_supervisor,1,1,1,1
+access_fp_rack_tag_manager,fp.rack.tag.manager,model_fp_rack_tag,group_fusion_plating_manager,1,1,1,1

fusion_plating/fusion_plating/views/fp_rack_tag_views.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright 2026 Nexa Systems Inc.
+    License OPL-1 (Odoo Proprietary License v1.0)
+    Part of the Fusion Plating product family.
+-->
+<odoo>
+
+    <record id="view_fp_rack_tag_list" model="ir.ui.view">
+        <field name="name">fp.rack.tag.list</field>
+        <field name="model">fp.rack.tag</field>
+        <field name="arch" type="xml">
+            <list string="Rack Tags" editable="bottom">
+                <field name="sequence" widget="handle"/>
+                <field name="name"/>
+                <field name="color" widget="color_picker"/>
+                <field name="active" widget="boolean_toggle"/>
+            </list>
+        </field>
+    </record>
+
+    <record id="action_fp_rack_tag" model="ir.actions.act_window">
+        <field name="name">Rack Tags</field>
+        <field name="res_model">fp.rack.tag</field>
+        <field name="view_mode">list</field>
+    </record>
+
+    <menuitem id="menu_fp_rack_tags"
+              name="Rack Tags"
+              parent="menu_fp_config"
+              action="action_fp_rack_tag"
+              sequence="48"/>
+
+</odoo>