feat(jobs+certs): milestone-cascade Phase 1 + session patch catch-up

Implements the milestone-cascade design (Phase 1) and catches the
fusion_plating_jobs / fusion_plating_certificates source up to entech.

Milestone cascade (this PR's core):
- fp.job: new computes all_steps_terminal, next_milestone_action,
  next_milestone_label; dispatcher action_advance_next_milestone with
  3 helpers (_action_open_draft_certs, _action_open_draft_delivery,
  _action_mark_active_delivery_delivered); _resolve_required_cert_types
  resolver; _fp_create_certificates rewritten to honour
  part.certificate_requirement + partner flags + loop over resolved
  cert types
- fp.job.workflow.state: new trigger_on_delivery_state Boolean;
  _fp_is_passed_for_job extended with delivery-state branch;
  Shipped state seed reroutes from default_kind=ship to the new trigger
- View: hide Finish & Next when all_steps_terminal; add 4 mutually-
  exclusive milestone buttons (Mark Job Done / Issue Certs / Schedule
  Delivery / Mark Shipped) bound to one dispatcher
- Cert gate (fusion_plating_certificates/models/fp_delivery.py):
  action_mark_delivered hard-blocks on draft certs; manager bypass
  via fp_skip_cert_gate=True context key
- 24 unit tests in test_fp_job_milestone_cascade.py covering computes,
  resolver, dispatcher, cert gate
- Spec: docs/superpowers/specs/2026-05-12-job-milestone-cascade-design.md
- Plan: docs/superpowers/plans/2026-05-12-job-milestone-cascade.md

Other entech changes caught up in this sync (from earlier session
patches not previously committed):
- fp.job version bump series 18.x → 19.0
- res_users_views.xml addition (signature widget in user prefs)
- racking inspection smart button removal
- various view/manifest touch-ups

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

fusion_plating/fusion_plating_jobs/views/fp_job_form_inherit.xml

@@ -35,11 +35,37 @@
                         string="Finish & Next"
                         class="btn-primary"
                         icon="fa-arrow-right"
-                        invisible="state not in ('confirmed', 'in_progress')"/>
-                <button name="action_print_traveller" type="object"
-                        string="Print Traveller"
+                        invisible="state not in ('confirmed', 'in_progress') or all_steps_terminal"/>
+
+                <!-- Milestone cascade (Phase 1). All four share the same
+                     dispatcher; visibility is gated on next_milestone_action
+                     so only one ever renders at a time. -->
+                <button name="action_advance_next_milestone" type="object"
+                        string="Mark Job Done"
+                        class="btn-success"
+                        icon="fa-check-circle"
+                        invisible="next_milestone_action != 'mark_done'"/>
+                <button name="action_advance_next_milestone" type="object"
+                        string="Issue Certs"
+                        class="btn-primary"
+                        icon="fa-certificate"
+                        invisible="next_milestone_action != 'issue_certs'"/>
+                <button name="action_advance_next_milestone" type="object"
+                        string="Schedule Delivery"
+                        class="btn-primary"
+                        icon="fa-truck"
+                        invisible="next_milestone_action != 'schedule_delivery'"/>
+                <button name="action_advance_next_milestone" type="object"
+                        string="Mark Shipped"
+                        class="btn-success"
+                        icon="fa-paper-plane"
+                        invisible="next_milestone_action != 'mark_shipped'"/>
+                <field name="all_steps_terminal" invisible="1"/>
+                <field name="next_milestone_action" invisible="1"/>
+                <button name="action_print_sticker" type="object"
+                        string="Print Sticker"
                         class="btn-secondary"
-                        icon="fa-print"
+                        icon="fa-tag"
                         invisible="state == 'draft'"/>
                 <button name="action_print_wo_detail" type="object"
                         string="Print WO Detail"
@@ -229,22 +255,6 @@
                         <field name="quality_hold_count" widget="statinfo"
                                string="Holds"/>
                     </button>
-                    <button name="action_view_racking_inspection" type="object"
-                            class="oe_stat_button" icon="fa-clipboard-check">
-                        <div class="o_stat_info">
-                            <field name="racking_inspection_state"
-                                   widget="badge"
-                                   class="o_stat_value"
-                                   decoration-success="racking_inspection_state == 'done'"
-                                   decoration-info="racking_inspection_state == 'inspecting'"
-                                   decoration-warning="racking_inspection_state == 'discrepancy_flagged'"
-                                   decoration-muted="racking_inspection_state == 'draft'"
-                                   invisible="not racking_inspection_state"/>
-                            <span class="o_stat_value"
-                                  invisible="racking_inspection_state">—</span>
-                            <span class="o_stat_text">Racking Insp.</span>
-                        </div>
-                    </button>
                     <button name="action_view_certificates" type="object"
                             class="oe_stat_button" icon="fa-certificate"
                             invisible="certificate_count == 0">