feat(sub12b): fp.job.step + fp.job — rack/move/traveller fields

fp.job.step:
  + requires_rack_assignment (related from recipe_node_id)
  + requires_transition_form (related)
  + move_ids (O2M from_step_id), incoming_move_ids (O2M to_step_id)
  + is_racked (compute, stored, depends rack_id) — drives tablet
    rack-vs-parts greyed-button guard
  + qty_at_step_start, qty_at_step_finish (advanced by move commits)

  NOTE: existing 'rack_id' field is reused as the 'current rack' pointer
  (already there on line 95). Adding requires_rack_assignment as a
  related from recipe_node_id for runtime gate evaluation.

fp.job:
  + qty_received, qty_visual_inspection_rejects, qty_rework
  + special_requirements (Text — paper traveller header)
  + active_timer_ids (filtered O2M, depends on Task 7's state field)
  + move_ids (O2M to fp.job.step.move)

All additive. No removed fields. Existing battle tests unaffected.

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

fusion_plating/fusion_plating/models/fp_job.py

@@ -186,6 +186,40 @@ class FpJob(models.Model):
         'job_id',
         string='Steps',
     )
+
+    # ===== Sub 12b — traveller header + active timer ========================
+    # Header counters mirror the paper traveller's "Qty Rec." / "VIS INSP."
+    # / "Rework" columns (screens 16-18). Sub 12c's traveller report pulls
+    # these into the printed header.
+    qty_received = fields.Integer(
+        string='Qty Received',
+        help='Paper traveller "Qty Rec." column.',
+    )
+    qty_visual_inspection_rejects = fields.Integer(
+        string='Visual Insp Rejects',
+        help='Paper traveller "VIS INSP." column.',
+    )
+    qty_rework = fields.Integer(
+        string='Qty Sent to Rework',
+        help='Paper traveller "Rework" column.',
+    )
+    special_requirements = fields.Text(
+        string='Special Requirements',
+        help='Long free-form spec text from customer; printed on the '
+             'traveller header (Sub 12c).',
+    )
+    active_timer_ids = fields.One2many(
+        'fp.job.step.timelog',
+        'job_id',
+        string='Active Timers',
+        domain=[('state', 'in', ('running', 'paused'))],
+        help='Sub 12b — used by tablet for live timer badges. Filtered '
+             'on state by Task 7\'s state field.',
+    )
+    move_ids = fields.One2many(
+        'fp.job.step.move', 'job_id',
+        string='Move Log',
+    )
     # step_count + step_done_count are stored (drive list views / stat
     # buttons in Task 1.8). step_progress_pct stays non-stored — it's a
     # cheap derivative. Odoo flags as inconsistent when stored and

fusion_plating/fusion_plating/models/fp_job_step.py

@@ -139,6 +139,41 @@ class FpJobStep(models.Model):
              'step in this job is done/skipped/cancelled.',
     )
 
+    # ===== Sub 12b — chain-of-custody + rack awareness =====================
+    # Note: rack_id (line 95 above) already exists — reused as the "current
+    # rack on this step" pointer. Sub 12b builds the runtime guards on top.
+    requires_rack_assignment = fields.Boolean(
+        related='recipe_node_id.requires_rack_assignment',
+        store=True,
+        help='If True, the Move Parts dialog requires a rack to be '
+             'assigned to the parts before the move commits. Snapshot '
+             'from the recipe step at job creation.',
+    )
+    requires_transition_form = fields.Boolean(
+        related='recipe_node_id.requires_transition_form',
+        store=True,
+    )
+    move_ids = fields.One2many(
+        'fp.job.step.move', 'from_step_id',
+        string='Outgoing Moves',
+    )
+    incoming_move_ids = fields.One2many(
+        'fp.job.step.move', 'to_step_id',
+        string='Incoming Moves',
+    )
+    is_racked = fields.Boolean(
+        string='Racked', compute='_compute_is_racked', store=True,
+        help='True when rack_id is set — drives the tablet rack-vs-parts '
+             'button-state guard (Move Parts greys out).',
+    )
+    qty_at_step_start = fields.Integer(string='Qty at Step Start')
+    qty_at_step_finish = fields.Integer(string='Qty at Step Finish')
+
+    @api.depends('rack_id')
+    def _compute_is_racked(self):
+        for rec in self:
+            rec.is_racked = bool(rec.rack_id)
+
     # ------------------------------------------------------------------
     # Cost rollup (Task 1.6)
     # cost_per_hour comes from fp.work.centre (Task 1.2 added it there).