feat(plating): Sub 4 — Contract Review (optional, QA-005 1:1 PDF)

Per-part contract review record (fp.contract.review) gated by a
customer-level toggle, signed in two sections (QA Assistant → QA
Manager), settings-based signer rosters (no new res.groups), banner on
the part form that auto-dismisses once the first MO for the part hits
confirmed. QA-005 Rev. 0 paper form reproduced 1:1 in a QWeb PDF.

Never blocks MO/SO/WO — review is purely an audit artefact.

Smoke test run on entech: 12 assertions pass including the 25-cell
risk matrix parity with the paper form and 22 KB PDF render.

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

fusion_plating/fusion_plating_quality/models/res_company.py

@@ -0,0 +1,51 @@
+# -*- 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 ResCompany(models.Model):
+    _inherit = 'res.company'
+
+    # Contract Review signer rosters. Company-scoped so multi-tenant
+    # Odoo deployments keep their own QA team isolated. Managed from
+    # Settings → Fusion Plating → Contract Review. Stored here (not
+    # as groups) so granting the right to sign a Contract Review does
+    # not cascade any other permission elsewhere in Odoo.
+    x_fc_qa_assistant_user_ids = fields.Many2many(
+        'res.users',
+        'res_company_qa_assistant_rel',
+        'company_id',
+        'user_id',
+        string='QA Assistant Signers',
+        domain=[('share', '=', False)],
+        help='Users authorised to sign Section 2.0 (Planning / Production '
+             'Review) on a Contract Review. Plating Managers can sign '
+             'regardless of this list.',
+    )
+    x_fc_qa_manager_user_ids = fields.Many2many(
+        'res.users',
+        'res_company_qa_manager_rel',
+        'company_id',
+        'user_id',
+        string='QA Manager Signers',
+        domain=[('share', '=', False)],
+        help='Users authorised to sign Section 3.0 (Quality Review) on a '
+             'Contract Review. Plating Managers can sign regardless of '
+             'this list.',
+    )
+
+    def _fp_get_qa_signers(self, section):
+        """Return effective signer roster for Section 2.0 or 3.0.
+
+        Central helper so Sub 6 (per-customer / contact profiles) can
+        layer overrides without touching the sign action call sites.
+        """
+        self.ensure_one()
+        if section == 20:
+            return self.x_fc_qa_assistant_user_ids
+        if section == 30:
+            return self.x_fc_qa_manager_user_ids
+        return self.env['res.users']