feat(fusion_plating_jobs): late_risk_ratio + active_step_id computes on fp.job

Plan tasks P2.2 + P2.3 batched (both small additive computes on fp.job;
local tests not run between them — entech verifies).

  late_risk_ratio  — stored Float, remaining_planned / minutes_to_deadline.
                     Drives the Manager At-Risk view (Phase 4).
                     Recomputes on step state, duration, deadline changes.

  active_step_id   — non-stored Many2one. Currently in_progress step
                     (lowest sequence if multiple — defensive).
                     Drives JobWorkspace landing focus.

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

fusion_plating/fusion_plating_jobs/models/fp_job.py

@@ -121,6 +121,57 @@ class FpJob(models.Model):
             tail = raw.rsplit('/', 1)[-1]
             job.display_wo_name = f'WO # {tail}'
 
+    # Phase 2 — At-Risk view + Workspace landing focus.
+    late_risk_ratio = fields.Float(
+        compute='_compute_late_risk_ratio',
+        store=True,
+        string='Late-risk Ratio',
+        help='remaining_planned_minutes / minutes_to_deadline. '
+             '>1.0 means the job will be late if nothing changes. '
+             'Drives the At-Risk view on the manager dashboard.',
+    )
+    active_step_id = fields.Many2one(
+        'fp.job.step',
+        compute='_compute_active_step_id',
+        string='Active Step',
+        help='Currently in-progress step (lowest sequence if multiple — '
+             'defensive). Drives JobWorkspace landing focus.',
+    )
+
+    @api.depends(
+        'date_deadline',
+        'step_ids.state',
+        'step_ids.duration_expected',
+    )
+    def _compute_late_risk_ratio(self):
+        from datetime import datetime
+        for job in self:
+            if not job.date_deadline:
+                job.late_risk_ratio = 0.0
+                continue
+            open_steps = job.step_ids.filtered(
+                lambda s: s.state not in ('done', 'skipped', 'cancelled')
+            )
+            remaining_planned = sum(open_steps.mapped('duration_expected') or [0])
+            if remaining_planned <= 0:
+                job.late_risk_ratio = 0.0
+                continue
+            now = datetime.now()
+            # date_deadline is naive UTC in Odoo; compare directly
+            minutes_to_deadline = max(
+                1.0,
+                (job.date_deadline - now).total_seconds() / 60.0,
+            )
+            job.late_risk_ratio = remaining_planned / minutes_to_deadline
+
+    @api.depends('step_ids.state', 'step_ids.sequence')
+    def _compute_active_step_id(self):
+        for job in self:
+            active = job.step_ids.filtered(
+                lambda s: s.state == 'in_progress'
+            ).sorted('sequence')
+            job.active_step_id = active[:1].id if active else False
+
     # ------------------------------------------------------------------
     # Sub 14 — Configurable workflow state (status bar milestone)
     # ------------------------------------------------------------------