feat(plating): CoC spec-optional + SO-style header + thickness for any cert

- Drop the hard spec_reference gate on fp.certificate.action_issue. The
  customer-facing description (_fp_resolve_customer_facing_description,
  walks job -> SO line, reuses fp_customer_description) now drives the CoC
  Process column; spec_reference prints only when an estimator fills it.
- CoC EN/FR reports swap web.external_layout for fp_external_layout_clean +
  paperformat_fp_a4_portrait. New shared coc_header (company logo + address
  left, Nadcap logo centre, title + Code128 barcode right) mirrors the Sale
  Order header. Removed the 3-logo Nadcap/AS9100/CGP accreditation strip and
  the body H1s; padding-top 0 on both body wrappers.
- Un-gate the Issue Certs wizard thickness upload (was invisible unless the
  customer was thickness-flagged) so a Fischerscope report can be attached to
  ANY cert; merge (page 2) + inline readings already render unconditionally.
- Update issue-gate tests, bump versions (certificates 19.0.9.1.0,
  reports 19.0.11.27.0, jobs 19.0.11.2.0), record CLAUDE.md rule 14c.

Deployed + render-verified on entech (CoC-30065, 223KB PDF, no QWeb errors).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

fusion_plating/fusion_plating_certificates/models/fp_certificate.py

@@ -496,16 +496,13 @@ class FpCertificate(models.Model):
                     and 'x_fc_owner_user_id' in rec.company_id._fields
                     and rec.company_id.x_fc_owner_user_id):
                 rec.certified_by_id = rec.company_id.x_fc_owner_user_id
-            # Spec reference is what the cert ATTESTS — without it the
-            # cert is just a piece of paper. AS9100 / Nadcap require
-            # naming the spec the work was performed to.
-            if not rec.spec_reference:
-                raise UserError(_(
-                    'Cannot issue certificate "%(name)s" — no Spec '
-                    'Reference set.\n\nFill the Spec Reference field '
-                    '(e.g. "AMS 2404", "MIL-C-26074") so the cert '
-                    'states which standard the work meets.'
-                ) % {'name': rec.name or rec.display_name})
+            # Spec Reference is OPTIONAL (client request 2026-05-28).
+            # The customer-facing description now serves as the cert's
+            # spec / certificate information (see
+            # _fp_resolve_customer_facing_description + the CoC Process
+            # column). spec_reference still prints below the description
+            # when an estimator chooses to fill it, but it no longer
+            # blocks issuance.
             # Process description (what was done to the parts). Without
             # it the cert PDF just shows blank process text — customer
             # has no idea what they paid for. Auto-filled from the
@@ -733,6 +730,53 @@ class FpCertificate(models.Model):
             return
         delivery.coc_attachment_id = self.attachment_id.id
 
+    def _fp_resolve_customer_facing_description(self):
+        """Resolve the customer-facing description used as the cert's
+        spec / certificate information on the printed CoC.
+
+        Client request 2026-05-28: Spec Reference is no longer
+        mandatory; the customer-facing description (what the estimator
+        actually typed on the order) now carries the descriptive text.
+
+        Resolution — first non-empty wins:
+          1. The order line matching this cert's job/part — cleaned via
+             sale.order.line.fp_customer_description() (strips the
+             "[code] product" prefix Odoo re-prepends).
+          2. Any product line on the linked sale order.
+        Returns '' when no order context exists; the report template
+        then falls back to process_description. All cross-module field
+        access is guarded so the method stays safe even if the jobs /
+        configurator layers aren't installed.
+        """
+        self.ensure_one()
+        job = self.x_fc_job_id if 'x_fc_job_id' in self._fields else False
+        so = self.sale_order_id or (
+            job.sale_order_id
+            if job and 'sale_order_id' in job._fields else False
+        )
+        if not so:
+            return ''
+        lines = so.order_line.filtered(lambda l: not l.display_type)
+        if not lines:
+            return ''
+        # Prefer the line whose part matches this cert's job.
+        part = (job.part_catalog_id
+                if job and 'part_catalog_id' in job._fields else False)
+        line = self.env['sale.order.line']
+        if part and 'x_fc_part_catalog_id' in lines._fields:
+            line = lines.filtered(
+                lambda l: l.x_fc_part_catalog_id == part
+            )[:1]
+        if not line:
+            line = lines[:1]
+        if not line:
+            return ''
+        if hasattr(line, 'fp_customer_description'):
+            desc = line.fp_customer_description()
+        else:
+            desc = line.name
+        return (desc or '').strip()
+
     def _fp_render_and_attach_pdf(self):
         """Render the CoC PDF via the bound report action, OPTIONALLY
         merge the Fischerscope thickness report PDF (uploaded by the