feat(workspace): per-kind step action buttons in Job Workspace

Fix: in the Job Workspace tablet view, the Start button was buried
inside a parent t-if that required the step to already be in_progress
or blocked. So ready/paused steps showed no buttons at all -
operators couldn't advance the WO from this screen (the reason the
user couldn't complete anything on WO-30057).

Template restructure (job_workspace.xml):
- Always-visible line 1 (icon + step# + name + ACTIVE/PAUSED badge + meta)
- Non-terminal detail panel (chips + instructions + opt-out + GateViz)
  visible on every non-done step so operator reads ahead
- Action row dispatched per-kind via getStepActions() helper

Per-kind action dispatcher (job_workspace.js):
- in_progress -> Record Inputs, Pause, Finish (or Finish & Sign Off)
- paused      -> Resume, Record Inputs, Finish
- contract_review (ready) -> Open QA-005 Form
- gating (ready)          -> Mark Passed (1-click start+finish)
- requires_rack_assignment -> Start (Assign Rack) - opens FpRackPartsDialog
- else (ready)            -> Start

5 new handlers: onPauseStep / onResumeStep / onMarkPassed /
onOpenContractReview / onStartWithRack. Pause and Resume use ORM RPC
(button_pause/button_resume) since no HTTP endpoint exists.

New model method (fp.job.step.action_mark_gating_passed):
- 1-click pass for gating steps - does button_start + button_finish
  in one transaction, posts chatter "Gate X marked passed by Y"
- Raises UserError if called on a non-gating step (defensive)
- Bypasses S21 required-inputs gate (gating steps have no inputs)

Controller: workspace_controller.py adds requires_rack_assignment to
the step payload so the JS dispatcher can route correctly.

Spec: docs/superpowers/specs/2026-05-24-workspace-step-actions-design.md
Sub-B (Record Inputs tablet polish: inputmode/prefill/date pickers/
signature pad/camera) is brainstormed but deferred.

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

fusion_plating/fusion_plating_jobs/models/fp_job_step.py

@@ -1397,6 +1397,50 @@ class FpJobStep(models.Model):
             },
         }
 
+    def action_mark_gating_passed(self):
+        """1-click pass for gating steps (kind=='gating').
+
+        Performs button_start (or button_resume if paused) followed by
+        button_finish in the same transaction. Posts a chatter audit on
+        the parent job naming the user.
+
+        Only valid for kind='gating' steps in state in (ready, pending,
+        paused). NOOPs on already-terminal steps for idempotency. Raises
+        UserError if called on a non-gating step (defensive — UI dispatcher
+        only renders Mark Passed for gating kinds).
+
+        Bypasses the S21 required-inputs gate (gating steps have no
+        required inputs by design — they're admin gates).
+
+        Spec: 2026-05-24-workspace-step-actions-design.md Change 5.
+        """
+        for step in self:
+            if step.state in ('done', 'skipped', 'cancelled'):
+                continue
+            kind_code = (
+                step.recipe_node_id.kind_id.code
+                if step.recipe_node_id and step.recipe_node_id.kind_id
+                else None
+            )
+            if kind_code != 'gating':
+                raise UserError(_(
+                    "Mark Passed is only valid for gating steps. "
+                    "This step's kind is %s."
+                ) % (kind_code or 'unknown'))
+            if step.state not in ('ready', 'pending', 'paused'):
+                continue
+            if step.state == 'paused':
+                step.button_resume()
+            if step.state != 'in_progress':
+                step.button_start()
+            step.with_context(
+                fp_skip_required_inputs_gate=True,
+            ).button_finish()
+            step.job_id.message_post(body=_(
+                'Gate "%(name)s" marked passed by %(user)s.'
+            ) % {'name': step.name, 'user': self.env.user.name})
+        return True
+
     def _fp_contract_review_redirect(self):
         """Return an ir.actions.act_window opening the part's QA-005
         Contract Review form, or False to indicate "no redirect needed".